afscp: allow listing of bare root.cell dirs in dynroot mode

afscp: allow listing of bare root.cell dirs in dynroot mode

don't assume that /afs/cell.name (as opposed to /afs/cell.name/)
is bogus. if there's text, at least try

Reviewed-on: http://gerrit.openafs.org/5480
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit fb1d7491fbe2e90300b23284f213cac2bdcd56ac)

Change-Id: I249b9a92b8931f0ac6feafdb9a0576bc83064c6f
Reviewed-on: http://gerrit.openafs.org/5482
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>