Change ''' to """ in bin/nova-{novncproxy,spicehtml5proxy}

Standard practice is for doc comment strings to be enclosed
in """ rather than '''. bin/nova-{novncproxy,spicehtml5proxy}
were exceptions to this.

Change-Id: I689063af2a51b26c971336b6fdbe60d5695b3ebc
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Merge "Change ''' to """ in bin/nova-{novncproxy,spicehtml5proxy}"