Windows: Handle RX_RESTARTING consistently for all RPCs

Windows: Handle RX_RESTARTING consistently for all RPCs

Translate RX_RESTARTING to the same cache manager error code
for all RPC classes.

LICENSE MIT

Change-Id: I4540e9886d1de68d9b3f8a2e72508f876225ff4a
Reviewed-on: http://gerrit.openafs.org/2654
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 87c9e7e6e4f8be4778d183940f349557193146c7)
Reviewed-on: http://gerrit.openafs.org/2701