MB-7954: RemoteConnection hangs when stop server

when use_channel=True we set timeout on blocking read/write operations for session

Change-Id: Ia9a1ade157643236375d85f544437484a6d51aa4
Reviewed-on: http://review.couchbase.org/25288
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>