Windows: Add global root to name array if share name

Windows: Add global root to name array if share name

If the share name was resolved by querying the service instead
of finding the entry in the root.afs root directory, construct
a name array in AFSParseName() that includes the AFSGlobalRoot
above the resolved share root directory.

In AFSBackupEntry, check for the case where two volume root entries
appear in sequence without an intervening mount point.

Change-Id: Ied0e0dc8226b0460d85a1f3a8b389294cfdef34b
Reviewed-on: http://gerrit.openafs.org/7252
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>