Add request/lock to opensource build

This is to fix Kokoro, given the directory added in [] Also, added forgotten keyring/api directory.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=167598465

java/google/registry/request/lock/BUILD

@@ -0,0 +1,16 @@
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+licenses(["notice"])  # Apache 2.0
+
+java_library(
+    name = "lock",
+    srcs = glob(["*.java"]),
+    deps = [
+        "//java/google/registry/model",
+        "@com_google_code_findbugs_jsr305",
+        "@com_google_dagger",
+        "@joda_time",
+    ],
+)