Remove kauth from libuafs

Remove the uafs_klog() apis from afs_usrops. Nothing uses it except
the obsolete afsweb stuff that isn't built anymore.

Stop linking in all kauth and pts components. Also remove some other
objects from libauth, rxkad, and com_err, that were only present as
dependencies of kauth and pts components

Change-Id: Idf83b3dd1098e874d90244fe72609666b13216a4
Reviewed-on: http://gerrit.openafs.org/9887
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Simon Wilkinson <simonxwilkinson@gmail.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>