Switch from Guava Optionals to Java 8 Optionals

This was a surprisingly involved change. Some of the difficulties included
java.util.Optional purposely not being Serializable (so I had to move a
few Optionals in mapreduce classes to @Nullable) and having to add the Truth
Java8 extension library for assertion support.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171863777

javatests/google/registry/util/BUILD

@@ -14,12 +14,13 @@ java_library(
         "//java/google/registry/config",
         "//java/google/registry/util",
         "//javatests/google/registry/testing",
-        "//third_party/java/truth",
         "@com_google_appengine_api_1_0_sdk",
         "@com_google_code_findbugs_jsr305",
         "@com_google_guava",
         "@com_google_guava_testlib",
         "@com_google_re2j",
+        "@com_google_truth",
+        "@com_google_truth_extensions_truth_java8_extension",
         "@joda_time",
         "@junit",
         "@org_mockito_all",

javatests/google/registry/util/CollectionUtilsTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.util.CollectionUtils.nullToEmpty;
 import static google.registry.util.CollectionUtils.partitionMap;
 

javatests/google/registry/util/ComparingInvocationHandlerTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static org.junit.Assert.fail;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;

javatests/google/registry/util/ConcurrentTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static org.junit.Assert.fail;
 
 import com.google.common.base.Function;

javatests/google/registry/util/DateTimeUtilsTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.util.DateTimeUtils.END_OF_TIME;
 import static google.registry.util.DateTimeUtils.START_OF_TIME;
 import static google.registry.util.DateTimeUtils.earliestOf;

javatests/google/registry/util/DiffUtilsTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.util.DiffUtils.prettyPrintEntityDeepDiff;
 import static google.registry.util.DiffUtils.prettyPrintSetDiff;
 

javatests/google/registry/util/DomainNameUtilsTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.util.DomainNameUtils.canonicalizeDomainName;
 
 import google.registry.testing.ExceptionRule;

javatests/google/registry/util/HexDumperTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
 import google.registry.testing.ExceptionRule;

javatests/google/registry/util/PosixTarHeaderSystemTest.java

@@ -16,6 +16,7 @@ package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.Truth.assertWithMessage;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.testing.SystemInfo.hasCommand;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assume.assumeTrue;

javatests/google/registry/util/PosixTarHeaderTest.java

@@ -17,6 +17,7 @@ package google.registry.util;
 import static com.google.common.io.BaseEncoding.base64;
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.Truth.assertWithMessage;
+import static com.google.common.truth.Truth8.assertThat;
 import static java.nio.charset.StandardCharsets.UTF_8;
 
 import com.google.common.testing.EqualsTester;

javatests/google/registry/util/RequestStatusCheckerImplTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.testing.LogsSubject.assertAboutLogs;
 import static org.mockito.Matchers.argThat;
 import static org.mockito.Mockito.mock;

javatests/google/registry/util/RetrierTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import google.registry.testing.ExceptionRule;
 import google.registry.testing.FakeClock;

javatests/google/registry/util/SerializeUtilsTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.util.SerializeUtils.deserialize;
 import static google.registry.util.SerializeUtils.serialize;
 

javatests/google/registry/util/SqlTemplateTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import google.registry.testing.ExceptionRule;
 import org.junit.Rule;

javatests/google/registry/util/TaskEnqueuerTest.java

@@ -16,6 +16,7 @@ package google.registry.util;
 
 import static com.google.appengine.api.taskqueue.TaskOptions.Builder.withUrl;
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;

javatests/google/registry/util/TeeOutputStreamTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static java.util.Arrays.asList;
 
 import com.google.common.collect.ImmutableSet;

javatests/google/registry/util/TypeUtilsTest.java

@@ -15,6 +15,7 @@
 package google.registry.util;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import google.registry.testing.ExceptionRule;
 import java.io.Serializable;

javatests/google/registry/util/UrlFetchUtilsTest.java

@@ -18,6 +18,7 @@ import static com.google.common.net.HttpHeaders.CONTENT_LENGTH;
 import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
 import static com.google.common.net.MediaType.CSV_UTF_8;
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.util.UrlFetchUtils.setPayloadMultipart;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.mockito.Matchers.any;