Update REST API objects to point to singular routes

Old paths preserved in 1.2 or older.  Existing function continues to be exposed.
Bug 1017000 - Expose correct form of gear-groups
Allow API versions >= 1.2 to create multiple domains
Expose both versions of routes (gear-groups and gear_groups)
Merge pull request #3807 from smarterclayton/to_stage_fix_api_url_links

Merged by openshift-bot
Merge pull request #3822 from smarterclayton/to_stage_bug_1017000_fix_more_routes

Merged by openshift-bot
Automatic commit of package [rubygem-openshift-origin-msg-broker-mcollective] release [1.15.4-1].
Automatic commit of package [rubygem-openshift-origin-node] release [1.15.10-1].
Automatic commit of package [openshift-origin-node-util] release [1.15.6-1].
Automatic commit of package [rubygem-openshift-origin-controller] release [1.15.11-1].
Automatic commit of package [rubygem-openshift-origin-console] release [1.15.8-1].
Automatic commit of package [openshift-origin-msg-node-mcollective] release [1.15.3-1].