Fix Gitlab MySQL url on new generation
Fix Gitlab MySQL url on new generation

Eventually was able to discover an error message in Gitlab-CI that 'The URL is
not supported by MySQL driver.' Turns out the driver expects the hostname:port
to be enclosed in parenthesis.

Related to https://github.com/gobuffalo/buffalo/issues/575

gobuffalo/buffalo,gobuffalo/buffalo,markbates/buffalo