ValidatorTest: Move to correct package

The class under test, OutgoingEmailValidator, is in the package:

  com.google.gerrit.server.mail.send

Move the test class to the same package.

Change-Id: I2d071a692aaf5c2b2bc1f09dd68e64110a646554

gerrit-server/BUILD

@@ -214,7 +214,7 @@ junit_tests(
         ["src/test/java/**/*.java"],
         exclude = TESTUTIL + PROLOG_TESTS + PROLOG_TEST_CASE + QUERY_TESTS,
     ),
-    resources = glob(["src/test/resources/com/google/gerrit/server/mail/*"]),
+    resources = glob(["src/test/resources/com/google/gerrit/server/**/*"]),
     visibility = ["//visibility:public"],
     deps = TESTUTIL_DEPS + [
         ":testutil",

gerrit-server/src/test/java/com/google/gerrit/server/mail/send/ValidatorTest.java

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.gerrit.server.mail;
+package com.google.gerrit.server.mail.send;
 
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.Truth.assert_;