mod_delegation: use clean_xmlns to remove jabber:client namespace from node: for the same reason as in mod_privilege, `jabber:client` namespace is removed with the clean_xmlns method coming from there. Furthermore, the forwarded <iq> stanza use the `jabber:client` xmlns while the stanza may come from a component with e.g. `jabber:component:accept` xmlns, this can lead to inconsistencies between the <iq> stanza and children (like <error> element).

---
summary: Cache caps on user sessions
---

Description
===========

This module listens on presences containing caps (XEP-0115) and asks the client
for the corresponding disco#info if it changed.

It fires the c2s-capabilities-changed event once the disco#info result is
received.

Compatibility
=============

  ------- ---------------
  trunk   Works
  0.11    Does not work
  0.10    Does not work
  ------- ---------------