Windows: AFSGetConnectionInfo partial match validation

Windows: AFSGetConnectionInfo partial match validation

AFSGetConnectionInfo() is called to respond to NPGetResourceInformation
and NPGetConnectionPerformance WNet API requests.  The former permits
the requestor to provide a path containing components that are not
processed by the file system represented by the called network provider.
As such partial matches are permitted BUT they must consist of full
components.  In other words, \\afs\sh is not a valid partial match for
\\afs\share but \\afs\share is a valid partial match for \\afs\share\dir.

This change adds validation checks to enforce full component comparisons.
It also cleans up some of the associated comparisons and trace output.

Change-Id: Ia736030f554f9770b201227c4dce26d7d45fe0d2
Reviewed-on: http://gerrit.openafs.org/11887
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>