Refactor etcd role

- Run docker run from script rather than directly from systemd target
- Refactoring styling/templates

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

roles/etcd/handlers/backup.yml

@@ -30,14 +30,20 @@
     mode: 0600
 
 - name: Backup etcd v2 data
-  command: "{{ bin_dir }}/etcdctl backup --data-dir {{ etcd_data_dir }} --backup-dir {{ etcd_backup_directory }}"
+  command: >-
+    {{ bin_dir }}/etcdctl backup
+      --data-dir {{ etcd_data_dir }}
+      --backup-dir {{ etcd_backup_directory }}
   environment:
     ETCDCTL_API: 2
   retries: 3
   delay: "{{ retry_stagger | random + 3 }}"
 
 - name: Backup etcd v3 data
-  command: "{{ bin_dir }}/etcdctl --endpoints={{ etcd_access_addresses }} snapshot save {{ etcd_backup_directory }}/snapshot.db"
+  command: >-
+    {{ bin_dir }}/etcdctl
+      --endpoints={{ etcd_access_addresses }}
+      snapshot save {{ etcd_backup_directory }}/snapshot.db
   environment:
     ETCDCTL_API: 3
   retries: 3