XMPP collaboration and scalability testing

There are three cases we want to test for

• XO's failing to connect to the xmpp server: (#5908)
• The xmpp server falling over (runs out of memory) (#5313)
• XO's and activities not showing up in all neighbourhood views (#6884,#6888,#6940,#7457)

Specifically, we want to know if these situations occur under all loads or only when the xmmp server has a certain amount of logged in users. And ofcourse, if the bug is on the server side or the client side

Work in progress..