Add ability to override endpoint creation

For new endpoint creation, only there's no endpoint with the
same region name and service id existing, the creation will
be executed.

closes-Bug: #1313690

Change-Id: Ib287f92f1ac9e75fb258381efe387a083d11efc6
bump metadata version
Merge pull request #11 from vnaboychenko/fix_region_endpoints

Add ability to override endpoint creation