Kill afs_inet_ntoa

Kill afs_inet_ntoa

Replace all calls to afs_inet_ntoa with the threadsafe
afs_inet_ntoa_r. afs_inet_ntoa was being used in a few places that may
be threaded (ubik), and in general should be avoided in case the
relevant code becomes threaded. Remove the definition of afs_inet_ntoa
to prevent anyone from using it.

Change-Id: I163d3f58fdd3d28077780963ced9995247682d78
Reviewed-on: http://gerrit.openafs.org/1680
Tested-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>