add ping/reply to assignment-client servers
don't send audio to nodes who don't have an active socket
don't attempt to send in UDPSocket with NULL destAddress
add debug to test hole punching
Merge branch 'master' of github.com:worklist/hifi into assignment
increase the ping interval
bring ping interval back to 1 second
add packet receive debug
add debug to AvatarMixer, not AudioMixer
remove crazy debug from testing
remove an infamous birarda extra g
remove the debug in Application.cpp
Merge pull request #1082 from birarda/assignment

ping/reply from servers for hole punching