Add junit deps explicitly

Reasons:
* Being explicit about deps is preferred
* It allows us to replace the dep in copybara instead of unconditionally
  adding a dep to java_tests, which allows use to use java_test rules
  with no srcs, which is sometimes useful. (See: cl/750758625)

Change-Id: I488b185000f14fa3c3e95176eda4c061f35cdf74

Author: jblebrun

java/src/test/java/com/google/oak/client/BUILD

@@ -38,6 +38,7 @@ java_test(
         "//proto/crypto:crypto_java_proto",
         "//proto/session:messages_java_proto",
         "@com_google_protobuf//:protobuf_javalite",
+        "@maven//:junit_junit",
     ],
 )
 

java/src/test/java/com/google/oak/crypto/BUILD

@@ -31,5 +31,6 @@ java_test(
         "//java/src/main/java/com/google/oak/crypto/hpke",
         "//java/src/main/java/com/google/oak/util",
         "//proto/crypto:crypto_java_proto",
+        "@maven//:junit_junit",
     ],
 )

java/src/test/java/com/google/oak/session/BUILD

@@ -31,5 +31,6 @@ java_test(
         "//java/src/main/java/com/google/oak/session:session_config_builder",
         "//proto/session:session_java_proto",
         "@com_google_protobuf//:protobuf_javalite",
+        "@maven//:junit_junit",
     ],
 )

java/src/test/java/com/google/oak/transport/BUILD

@@ -37,6 +37,7 @@ java_test(
         "@io_grpc_grpc_java//core:inprocess",
         "@io_grpc_grpc_java//stub",
         "@io_grpc_grpc_java//testing",
+        "@maven//:junit_junit",
         "@org_mockito_mockito_core",
     ],
 )

java/src/test/java/com/google/oak/util/BUILD

@@ -26,5 +26,6 @@ java_test(
     test_class = "com.google.oak.util.ResultTest",
     deps = [
         "//java/src/main/java/com/google/oak/util",
+        "@maven//:junit_junit",
     ],
 )