HORNETQ-1389 : JGroupsBroadcastGroupConfiguration Serialization Problem
Added an AtomicInteger to track freeFiles size, so as to avoid a full scan on each ConcurrentLinkedQueue#size() call.
Merge pull request #1769 from esarbanis/freefiles-size-monitor

Added an AtomicInteger to monitor freeFiles size.
Merge pull request #1768 from gaohoward/master_HORNETQ-1389

HORNETQ-1389 : JGroupsBroadcastGroupConfiguration Serialization Problem
HORNETQ-1374 - Ability to close all consumers on a destination and the connections for these consumers