- send messages for Gatewaystatistics on startup for all configured gateways.
- intercept & parse responses for Gatewaystatistics
- prevent away to online flag change from hitting db again, as user has not really logged in again

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@13701 b35dd754-fafc-0310-a699-88a17e54d16e