Remove the example references in Dockerfile.
Remove the example references in Dockerfile.

telstra/open-kilda,carmine/open-kilda,nikitamarchenko/open-kilda,nikitamarchenko/open-kilda,telstra/open-kilda,carmine/open-kilda,nikitamarchenko/open-kilda,nikitamarchenko/open-kilda,telstra/open-kilda,jonvestal/open-kilda,carmine/open-kilda,jonvestal/open-kilda,jonvestal/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,jonvestal/open-kilda,nikitamarchenko/open-kilda,carmine/open-kilda,carmine/open-kilda,telstra/open-kilda,carmine/open-kilda,jonvestal/open-kilda,nikitamarchenko/open-kilda