Windows: cm_SetServerBusyState use cm_ServerEqual

Windows: cm_SetServerBusyState use cm_ServerEqual

When the busy state of a server is set it must apply to all
server references if the server is multi-homed.  Use cm_ServerEqual()
to do so.

Reviewed-on: http://gerrit.openafs.org/7355
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
(cherry picked from commit 345d643729ed588c4e49e69607bee5793809b01d)

Change-Id: Ibd96cecce936353ef639de3f0dafb32abb7b29af
Reviewed-on: http://gerrit.openafs.org/8624
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>