Monitoring plugin: MAM implementation should properly advertise support
— If a server or other entity hosts archives and supports MAM queries, it MUST advertise the 'urn:xmpp:mam:2' feature in response to Service Discovery (XEP-0030)  requests made to archiving JIDs (i.e. JIDs hosting an archive, such as users' bare JIDs)
The monitoring plugin should add the MAM feature to the response of such requests made against user JIDs.
Add support for urn:xmpp:mam:2.
Only urn:xmpp:mam:0 and urn:xmpp:mam:1 namespaces are actually currently supported. The requirement for :2 support is that openfire guarantees that all live messages are tagged with a stanza ID. This is already been implemented in Openfire for Message Carbons.
We only need to bump the namespace.
changed to a blocker to help remember to release the updated monitoring plugin once openfire 4.3.0 is released. Currently, the plugin carries a snapshot release number