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: XMPP Compliance Suites 2021 self-test
rockspec:
  dependencies:
  - mod_cloud_notify
  - mod_smacks
  - mod_bookmarks
...

Compare the list of enabled modules with
[XEP-0443: XMPP Compliance Suites 2021] and produce basic report to the
Prosody log file.

If installed with the Prosody plugin installer (trunk/0.12+ required)
then all modules needed for a green checkmark should be included.