Resilient worker

[vyper]

Retry worker when receive...

, [2017-03-29T18:29:12.011075 #5] DEBUG -- : Failing with status #<struct Struct::Status code=14, details="{\"created\":\"@1490812152.010328204\",\"description\":\"Endpoint read failed\",\"file\":\"src/core/ext/transport/chttp2/transport/chttp2_transport.c\",\"file_line\":1851,\"grpc_status\":14,\"occurred_during_write\":0,\"referenced_errors\":[{\"created\":\"@1490812152.010323670\",\"description\":\"Secure read failed\",\"file\":\"src/core/lib/security/transport/secure_endpoint.c\",\"file_line\":166,\"referenced_errors\":[{\"created\":\"@1490812152.010316833\",\"description\":\"Socket closed\",\"fd\":15,\"file\":\"src/core/lib/iomgr/tcp_posix.c\",\"file_line\":249,\"target_address\":\"ipv4:172.217.29.106:443\"}]}]}", metadata={}>
```