Revert "Use memcached based cache in nova in all devstack-tempest jobs"

This reverts commit eb0a2cc5f240d52efa3a58c5a1ba8821bae3147e.

This break jobs that do not deploy nova, like ironic, see e.g. http://logs.openstack.org/98/670698/5/check/ironic-standalone/d9d3d0e/job-output.txt.gz#_2019-07-31_03_56_36_492216

Change-Id: I91cd10b1b3cd5c825dec34fcb814f6b9dc4460c8
1 file changed