Support xip.io wildcard DNS as a VHOST #1005
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http://xip.io
xip.io is a service by Basecamp that provides a wildcard DNS service on the public internet. Any .xip.io will return a DNS response for the IP address, same with ..xip.io.
The domains plugin in dokku uses a regex to match IP4 and IP6 addresses in the VHOST file, and disables VHOST support if found. This PR changes those patterns to require that the VHOST entry ends with the IP address.
This is a gist where my VHOST setting is "127.0.0.1.xip.io" that demonstrates the original output, linked directly to the line from
plugins/domains/commands: https://gist.github.com/anonymous/c529177f20b36beda80d#file-debug-log-L1373