Add designate-tempest-plugin-distgit to newton tag
Add designate-tempest-plugin-distgit to newton tag

Initial import of distgit was merged in
https://review.rdoproject.org/r/#/c/1366/.

Change-Id: I0044ec004194e92914a0c792185135be1cf9936b

redhat-openstack/rdoinfo,javierpena/rdoinfo