Move set_facts to kubespray-defaults defaults

These facts can be generated in defaults with a performance
boost.

Also cleaned up duplicate etcd var names.

roles/etcd/tasks/install_rkt.yml

@@ -18,7 +18,7 @@
     --mount=volume=bin-dir,target=/host/bin
     {{ etcd_image_repo }}:{{ etcd_image_tag }}
     --name=etcdctl-binarycopy
-    --exec=/bin/cp -- {{ etcd_container_bin_dir }}/etcdctl /host/bin/etcdctl
+    --exec=/bin/cp -- /usr/local/bin/etcdctl /host/bin/etcdctl
   register: etcd_task_result
   until: etcd_task_result.rc == 0
   retries: 4