Use openshift_is_containerized instead of openshift_is_atomic when installing etcd

This allows non-Atomic hosts to be used to install containerized etcd

roles/etcd/tasks/auxiliary/drop_etcdctl.yml

@@ -1,7 +1,7 @@
 ---
 - name: Install etcd for etcdctl
   package: name=etcd{{ '-' + etcd_version if etcd_version is defined else '' }} state=present
-  when: not openshift_is_atomic | bool
+  when: not openshift_is_containerized | bool
   register: result
   until: result is succeeded