Allow simple_listener to attach to a stream after simple_talker has been
running for at least 1 second (i.e. TA New{SNE} has changed to Join{SJO}).

Also fix compiler warning in usage() function: add a version_str.
Also fix warning in join_vlan() about send_msg() by moving join_vlan().
Merge pull request #43 from craiggunther/open-avb-next

Allow simple_listener to attach to a stream after simple_talker has been running for at least 1 second