Windows: mp target trailing dot not part vol name

Windows: mp target trailing dot not part vol name

Instead of passing "root.cell." into cm_FreelanceAddMount
pass in "root.cell" and add the trailing dot within the function.

Reviewed-on: http://gerrit.openafs.org/4124
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 0d1335ad7104a6fa67525b84d70a33e7bb1b6c6a)

Change-Id: I27b077c7fd9e8ea5cb67da96b5172d69623e1122
Reviewed-on: http://gerrit.openafs.org/4221
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>