[linux-cifs-client] [[patch] cifs: implement hard mount option behaviour

[shirishpargaonkar at gmail.com]

Add support for hard mount option, allow interruptable timeouts while
waiting for command/request responses.
Sometimes the responses from commands/requests do not arrive within
expected timeouts which results in unnecessary reconnects for 
server might be slow in responding ablieit response will come and
a reconnect was really not warranted.