Gitlab routes and DNSLB integration
Add features to support GitLab routers and integrate with DNSLB (for [CIPAAS-193|https://its.cern.ch/jira/browse/CIPAAS-193], works in conjuction with https://gitlab.cern.ch/ai/it-puppet-hostgroup-paas/merge_requests/44)
Resolve #2 (closed) (simplified support for IPv6; now documented in the router deployment section in OneNote)