OF-584: The ordered lists of hosts that is resolved through DNS SRV should not only be prioritized, but also randomized based on weight value. As a result, connection attempts should be divided over all hosts that share the highest priority.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@13342 b35dd754-fafc-0310-a699-88a17e54d16e