Windows: AFSExFreePool -> AFSExFreePoolWithTag

Windows: AFSExFreePool -> AFSExFreePoolWithTag

Replace AFSExFreePool() with AFSExFreePoolWithTag() which is
a wrapper around both ExFreePool() and ExFreePoolWithTag().
If a 'Tag' value, is provided, ExFreePoolWithTag() is used.
Otherwise, ExFreePool().

Specify allocation tag values wherever possible.  Path name buffer
tags are not specified because they are allocated using multiple
tags.  The same is true for network provider string buffers.

This is being done in order to debug a memory corruption issue.

Warning: this is a change to the AFSRedir->AFSRedirLib interface
and therefore both drivers must be updated with a reboot and
not simply restarting the service.

Change-Id: Id5c0503141d1077d6c2beae5d28602160105a312
Reviewed-on: http://gerrit.openafs.org/7807
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>