First step of converting userId to JID (not tested much)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
UsersProvider converted to full JID usage too

That should be all. But it needs some extensive
testing before merge to master.

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Merge branch 'master' into full_jid
Clean some extra forgotten logs

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>