Windows: Treat invalid AFSFetchStatus as VBUSY

Windows: Treat invalid AFSFetchStatus as VBUSY

Modify cm_Analyze() to accept an AFSFetchStatus parameter which
when set is verified for validity.  If the status info is invalid,
then consider the response equivalent to VBUSY and attempt to
query an alternate file server (if any.)   Log the invalid status
info to the Windows Application Event Log as a Warning.

When cm_Analyze() is processing the response of an RPC that returns
multiple AFSFetchStatus structures, pass in the one that corresponds
with the source object.

Change-Id: I84be22f332ff6fd7bc9620347f958538a3412380
Reviewed-on: http://gerrit.openafs.org/8404
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>