Update Python Dockerfile's unit test list

The removal of grpc.framework.assembly.implementations_test should have
happened along with the removal of the test itself in 31e65bea.

tools/dockerfile/grpc_python/Dockerfile

@@ -53,13 +53,15 @@ RUN cd /var/local/git/grpc \
   && python2.7 -B -m grpc._adapter._links_test \
   && python2.7 -B -m grpc._adapter._lonely_rear_link_test \
   && python2.7 -B -m grpc._adapter._low_test \
-  && python2.7 -B -m grpc.framework.assembly.implementations_test \
+  && python2.7 -B -m grpc.early_adopter.implementations_test \
   && python2.7 -B -m grpc.framework.base.packets.implementations_test \
   && python2.7 -B -m grpc.framework.face.blocking_invocation_inline_service_test \
   && python2.7 -B -m grpc.framework.face.event_invocation_synchronous_event_service_test \
   && python2.7 -B -m grpc.framework.face.future_invocation_asynchronous_event_service_test \
   && python2.7 -B -m grpc.framework.foundation._later_test \
-  && python2.7 -B -m grpc.framework.foundation._logging_pool_test
+  && python2.7 -B -m grpc.framework.foundation._logging_pool_test \
+  && python2.7 -B -m interop._insecure_interop_test \
+  && python2.7 -B -m interop._secure_interop_test
 
 # Add a cacerts directory containing the Google root pem file, allowing the interop client to access the production test instance
 ADD cacerts cacerts