Call send_multipart correctly when responding to heartbeats
Call send_multipart correctly when responding to heartbeats

alexhersh/calico,matthewdupre/felix,nbartos/calico,alexaltair/calico,matthewdupre/felix,nbartos/calico,neiljerram/felix,TrimBiggs/calico,anortef/calico,kasisnu/calico,anortef/calico,alexhersh/calico,ocadotechnology/calico,fasaxc/felix,neiljerram/felix,neiljerram/felix,Metaswitch/calico,kasisnu/calico,beddari/calico,Metaswitch/calico,alexaltair/calico,fasaxc/felix,beddari/calico,TrimBiggs/calico,ocadotechnology/calico,neiljerram/felix