Fix etcd backend certificates not being templated

etcd backend certificates won't be templated due to
`etcd_enable_tls_backend` not being defined, which results in the
`kolla_copy_backend_tls_files` variable evaluating to false.

Change-Id: I04d3b93aa15fb18fb8beefd49c0ba8a0c0dfca08
Signed-off-by: Jake Hutchinson <[email protected]>
(cherry picked from commit 44e56e8)

Author: assumptionsandg

ansible/roles/etcd/defaults/main.yml

@@ -85,3 +85,8 @@ etcd_remove_deleted_members: "no"
 # Copy certificates
 ###################
 etcd_copy_certs: "{{ kolla_copy_ca_into_containers | bool or etcd_enable_tls | bool }}"
+
+###################
+# TLS
+###################
+etcd_enable_tls_backend: "{{ etcd_enable_tls | bool }}"

releasenotes/notes/bugfix-etcd-backend-certificates-c163bc60e5cbcd2c.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fix an issue causing etcd backend TLS certificates to not be templated as
+    the ``kolla_copy_backend_tls_files`` variable was evaluating to false due
+    to the ``etcd_enable_tls_backend`` variable being undefined.