vol: Log ignored dirs that look like partitions

vol: Log ignored dirs that look like partitions

If we see a /vicep*-like directory when we VAttachPartitions, and we
ignore it because it lacks an AlwaysAttach, log that we ignored it.
This may make things less confusing to admins that just try to create
a /vicep* directory and don't know why it doesn't work.

Feature suggested by Jason Edgecombe.

FIXES 128221

Change-Id: I0802f914658c7df413b22b3726a5085f1b646266
Reviewed-on: http://gerrit.openafs.org/2893
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>