Add the Python interop client to gce_setup files

tools/gce_setup/grpc_docker.sh

@@ -921,6 +921,17 @@ grpc_interop_gen_ruby_cmd() {
   echo $the_cmd
 }
 
+# constructs the full dockerized python interop test cmd.
+#
+# call-seq:
+#   flags= .... # generic flags to include the command
+#   cmd=$($grpc_gen_test_cmd $flags)
+grpc_interop_gen_python_cmd() {
+  local cmd_prefix="sudo docker run grpc/python bin/bash -l -c"
+  local the_cmd="$cmd_prefix 'python -B -m interop.client --use_test_ca --use_tls $@'"
+  echo $the_cmd
+}
+
 # constructs the full dockerized java interop test cmd.
 #
 # call-seq:

tools/gce_setup/interop_test_runner.sh

@@ -36,7 +36,7 @@ echo $result_file_name
 main() {
   source grpc_docker.sh
   test_cases=(large_unary empty_unary ping_pong client_streaming server_streaming cancel_after_begin cancel_after_first_response)
-  clients=(cxx java go ruby node csharp_mono)
+  clients=(cxx java go ruby node python csharp_mono)
   servers=(cxx java go ruby node python)
   for test_case in "${test_cases[@]}"
   do