Update rspec to pass stable/juno
Update rspec to pass stable/juno

Glance API unit tests could not pass rspec because the configuration
file has changed in stable/juno puppet upstream.
This patch aims to fix it.

Change-Id: I2a00eb990b70af5e5febedf7ffe3a9ef50463b37

gwdg/puppet-openstack-cloud,gwdg/puppet-openstack-cloud,gwdg/puppet-openstack-cloud,redhat-cip/puppet-openstack-cloud,redhat-cip/puppet-openstack-cloud,redhat-cip/puppet-openstack-cloud,gwdg/puppet-openstack-cloud