Actionize the EPP endpoints.

This introduces Actions and Dagger up until FlowRunner. The changes
to the servlets are relatively simple, but the required changes to
the tests, as well as to auxillary EPP endpoints (such as the http
check api and the load test servlet) were vast. I've added some
comments in critique to make the review easier that don't really
make sense as in-code comments for the future.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=124593546

javatests/google/registry/flows/EppToolActionTest.java

@@ -0,0 +1,68 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+package google.registry.flows;
+
+import static com.google.common.truth.Truth.assertThat;
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.mockito.Mockito.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.mockito.ArgumentCaptor;
+
+/** Tests for {@link EppToolAction}. */
+@RunWith(JUnit4.class)
+public class EppToolActionTest {
+
+  private void doTest(boolean dryRun, boolean superuser) {
+    EppToolAction action = new EppToolAction();
+    action.clientIdentifier = "ClientIdentifier";
+    action.dryRun = dryRun;
+    action.superuser = superuser;
+    action.eppRequestHandler = mock(EppRequestHandler.class);
+    action.xml = "<xml>";
+    action.run();
+    ArgumentCaptor<SessionMetadata> captor = ArgumentCaptor.forClass(SessionMetadata.class);
+    verify(action.eppRequestHandler).executeEpp(captor.capture(), eq(action.xml.getBytes(UTF_8)));
+    SessionMetadata sessionMetadata = captor.getValue();
+    assertThat(sessionMetadata.getClientId()).isEqualTo("ClientIdentifier");
+    assertThat(sessionMetadata.isDryRun()).isEqualTo(dryRun);
+    assertThat(sessionMetadata.isSuperuser()).isEqualTo(superuser);
+  }
+
+  @Test
+  public void testDryRunAndSuperuser() throws Exception {
+    doTest(true, true);
+  }
+
+  @Test
+  public void testDryRun() throws Exception {
+    doTest(true, false);
+  }
+
+  @Test
+  public void testSuperuser() throws Exception {
+    doTest(false, true);
+  }
+
+  @Test
+  public void testNeitherDryRunNorSuperuser() throws Exception {
+    doTest(false, false);
+  }
+}