Chunk server: fix possible double free in meta server state machine by ensuring that in flight RPC is not hello or authentication before deleting the RPC.
Chunk server: fix possible double free in meta server state machine by ensuring that in flight RPC is not hello or authentication before deleting the RPC.

quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs