res_xmpp: Buddies are always auto-registered when processing the roster

res_xmpp: Buddies are always auto-registered when processing the roster

Due to a quirk in the configuration handling of res_xmpp, the 'autoregister'
setting was never actually processed. This was due to not properly copying
over the global settings to the client settings when applying the
configuration to the run-time object.

ASTERISK-14233
ASTERISK-24780 #close
Reported by: Simon Arlott
patches:
  asterisk-13.1.0-24780 uploaded by Simon Arlott (License 5756)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@433395 65c4cc65-6c06-0410-ace0-fbb531ad65f3