Update change log (release 1.50.0)
Update change log (release 1.50.0)

telstra/open-kilda,jonvestal/open-kilda,jonvestal/open-kilda,jonvestal/open-kilda,jonvestal/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,jonvestal/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda