add pa looptest; tweak debug msg; reload devlist on devchange, say a USB mic pluged/unpluged; Fix dev settings bug where currentIndex does not match device id
I know I should commit multi times for each fixes/features, but hard to separate them, commit at one time for now

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk/contrib@16229 d0543943-73ff-0310-b7d9-9358b9ac24b2