fix jingle negotiation from an XMPP point of view

3 jobs for master in 2 minutes and 57 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #6123
run-pylint

00:02:33

passed #6122
run-test

00:00:10

 
  Build
passed #6124
run-build

00:00:13