Windows: replace lana_OnlyLoopback() calls

lana_OnlyLoopback() relies upon Netbios over TCP being enabled but
Netbios over TCP is not officially supported on Vista and above.
Replace all lana_OnlyLoopback() calls with a test on the number of
network interfaces as computed by syscfg_GetIFInfo().   That list
excludes loopback interfaces.

Reviewed-on: http://gerrit.openafs.org/11444
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit ec1dcfbe29961fad23dec087c2d214be785a7816)

Change-Id: I6106fe5a0b080110966018138beff2b7f82f87ae
Reviewed-on: http://gerrit.openafs.org/11495
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: introduce cm_MarkServerDown

Consolidate the operations necessary to mark a server down into a
new routine cm_MarkServerDown()

Reviewed-on: http://gerrit.openafs.org/11445
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 15c62a9dd014dc56192c8e880fa6855f5377154e)

Change-Id: Ied2fbb0b7d5c80a928bac6d8c648280b82941a00
Reviewed-on: http://gerrit.openafs.org/11496
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>