afscp: add confdir override

afscp: add confdir override

allow an alternate config dir

Reviewed-on: http://gerrit.openafs.org/5476
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 97004b7b0970bfc2744df49d540521a41177cac8)

Change-Id: I6e0ac4b3a457dafe27ea380bf25ca2d7c8f7361b
Reviewed-on: http://gerrit.openafs.org/5481
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>