Windows: Freelance Import CellServDB

Windows: Freelance Import CellServDB

Add a new registry option that permits automatic generation of
Freelance mountpoints for every cell listed in the CellServDB info
(file and registry).  "FreelanceImportCellServDB".  This functionality
is only triggered when the afsd_service is started.   The operation
is performed in the background by the daemon thread after the firewall
configuration is set.

LICENSE MIT

Change-Id: Ic6cc0738f8c185d77f9cf69d4997b8044522e50e
Reviewed-on: http://gerrit.openafs.org/2079
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>