Refuse to attach inode partitions with UFS logging

Refuse to attach inode partitions with UFS logging

Partitions with the 'logging' UFS mount option are known to cause
corruption when using the inode fileserver backend. So, if we detect
that we are attempting to attach a 'logging' partition, refuse to attach
it.

Change-Id: I0ee23b9935ac6ffc66e6228fe03d6bbfb5d64574
Reviewed-on: http://gerrit.openafs.org/999
Tested-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>