Increase keepalive timeout to 60s to fight against deadline exceeded

Author: shunping

sdks/python/conftest.py

@@ -56,7 +56,7 @@ def configure_beam_rpc_timeouts():
 
   timeout_env_vars = {
       'GRPC_ARG_KEEPALIVE_TIME_MS': '30000',
-      'GRPC_ARG_KEEPALIVE_TIMEOUT_MS': '10000',
+      'GRPC_ARG_KEEPALIVE_TIMEOUT_MS': '60000',
       'GRPC_ARG_HTTP2_MAX_PINGS_WITHOUT_DATA': '0',
       'GRPC_ARG_KEEPALIVE_PERMIT_WITHOUT_CALLS': '1',
       'GRPC_ARG_HTTP2_MIN_RECV_PING_INTERVAL_WITHOUT_DATA_MS': '300000',