Windows: replace lana_OnlyLoopback() calls

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.

Change-Id: I22d952f1487734ead02335108377bc404baa6024
Reviewed-on: http://gerrit.openafs.org/11444
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>