Added 'absent' to states.reg.
attempt to delete as a value if not a key
Fix keystone.user_passwrod_update examples

Fixes #15654
Merge pull request #15657 from rallytime/keystone_doc_fix

Fix keystone.user_passwrod_update examples
Merge pull request #15643 from UtahDave/2014.7fixreg

attempt to delete as a value if not a key
Merge pull request #14660 from eliasp/2014.7-states.reg.absent

Added 'absent' to states.reg.