Added test for Limit formatting routes when adding resources

Added test to allows identifiers with a '.' in delete metadata url.
A few tests were added to the extensions test to prove that .xml and
 .json are stripped.

Depends-On: https://review.openstack.org/#/c/571403/
Change-Id: I47b1a48fc07deea086470a71b93d88c8f9232932
Partial-Bug: #1774353
2 files changed