Deprecate the in-tree keystone plugin

We now have the `client-keystone-auth` in cloud-provider-openstack repository: https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/using-client-keystone-auth.md So let's drop the in-tree one, so we can remove it in 1.12

Deprecate the in-tree keystone plugin
ffe817fc · Davanum Srinivas · 8ad67d34 · ffe817fc
Unverified Commit ffe817fc authored May 25, 2018 by Davanum Srinivas
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openstack.go ...o/client-go/plugin/pkg/client/auth/openstack/openstack.go +1 -0

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--- a/staging/src/k8s.io/client-go/plugin/pkg/client/auth/openstack/openstack.go
+++ b/staging/src/k8s.io/client-go/plugin/pkg/client/auth/openstack/openstack.go
@@ -140,6 +140,7 @@ func newOpenstackAuthProvider(_ string, config map[string]string, persister rest
 	var ttlDuration time.Duration
 	var err error

+	glog.Warningf("WARNING: in-tree openstack auth plugin is now deprecated. please use the \"client-keystone-auth\" kubectl/client-go credential plugin instead")
 	ttl, found := config["ttl"]
 	if !found {
 		ttlDuration = DefaultTTLDuration