Upgrade cloud-provider-openstack and k8s-keystone-auth to 1.15.0#53

ctrlaltdel wants to merge 2 commits intomasterinfraly/k8s-on-openstack:masterfrom

cloud-provider-openstack-v1-15-0infraly/k8s-on-openstack:cloud-provider-openstack-v1-15-0Copy head branch name to clipboard