Modify image names to match the one in dockerhub.

tools/run_tests/dockerize/build_interop_image.sh

@@ -62,9 +62,9 @@ fi
 # on OSX use md5 instead of sha1sum
 if which sha1sum > /dev/null;
 then
-  BASE_IMAGE=${BASE_NAME}_base:`sha1sum tools/dockerfile/interoptest/$BASE_NAME/Dockerfile | cut -f1 -d\ `
+  BASE_IMAGE=${BASE_NAME}_`sha1sum tools/dockerfile/interoptest/$BASE_NAME/Dockerfile | cut -f1 -d\ `
 else
-  BASE_IMAGE=${BASE_NAME}_base:`md5 -r tools/dockerfile/interoptest/$BASE_NAME/Dockerfile | cut -f1 -d\ `
+  BASE_IMAGE=${BASE_NAME}_`md5 -r tools/dockerfile/interoptest/$BASE_NAME/Dockerfile | cut -f1 -d\ `
 fi
 
 if [ "$DOCKERHUB_ORGANIZATION" != "" ]