We have next commit in fuel-web https://review.openstack.org/#/c/303281/2
that add expectation of int type of release_id.
In fuel-qa when we create cluster we get release id by release name
and then cast it to string - that leads to 400
bad request with "message": "deque(['release']): u'2'
is not of type 'integer'", "errors": []}
Closes-Bug: #1571780
Change-Id: Ie894a056f33d770bebece4f4d24e3261b368c35a
c9f68fbfcc