mod_http_oauth2: Change password grant to take username instead of JID [BC] For consistency since the other grant types do not accept JIDs This has been like this from the beginning of this module. Changing this breaks backwards-compatibility with anything that relied on the JID as username, but things shouldn't really be using the password grant anyway as it is insecure.

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summary: Allow server administrators to probe any user
...

This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.

Compatibility
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  trunk   Doesn't work (uses is_admin)
  0.12    Works?
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