Catch custom thrift exceptions in SRRoute and ThriftTransport and map to carbon result codes
Catch custom thrift exceptions in SRRoute and ThriftTransport and map to carbon result codes

Summary: As above

Reviewed By: udippant

Differential Revision: D35838612

fbshipit-source-id: 9d0329dfd8a262935a1c75f174081ecb108b81e1

facebook/mcrouter,facebook/mcrouter,facebook/mcrouter,facebook/mcrouter