Move core migration into origin-server

Move unit tests from li to origin-server
Move migrate_action into openshift agent, move cuke tests
Rename rhc-admin-migrate to oo-admin-migrate and move into origin-server

Trello: https://trello.com/c/1KV8NmDJ (runtime_319)
Merge pull request #2954 from pmorie/dev/os_migrations

Merged by openshift-bot