Fix check run for tooz
Fix check run for tooz

Previously no tests were run. Now set it up to
run at least the tests against memcached, extend
buildrequires accordingly, otherwise tests are failing with:

  File "/home/abuild/rpmbuild/BUILD/tooz-1.59.0/tooz/tests/__init__.py", line 20, in <module>
       import fixtures
  ImportError: No module named fixtures

Change-Id: Ie7fdbfecf9da06fdff5e04473f69f4117fd8e65f

openstack/rpm-packaging,openstack/rpm-packaging