Updated openstack/openstack
Project: openstack/tempest  51cd63c6de1570db68655a7a1a972910a49e0876

Refactor ways of creating anonymous test user

Some Swift tests require random user creation to test ACL features or
prepare special data by reseller admin's requests, but that occurs
code duplication. Especially, assigning role id code was too lengthy.

This commit aggregates common codes and remove unused clean-up statements.

Change-Id: I4b965fceeec7c9cd1857375053e148d85f5f5bca