Add python bazel deps needed to run resolver component tests
diff --git a/WORKSPACE b/WORKSPACE
index adce809..8b68c0d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1,4 +1,5 @@
 workspace(name = "com_github_grpc_grpc")
 
-load("//bazel:grpc_deps.bzl", "grpc_deps")
+load("//bazel:grpc_deps.bzl", "grpc_deps", "grpc_test_only_deps")
 grpc_deps()
+grpc_test_only_deps()