To be sure that ~/.ssh directory exist

Change-Id: I2374bfb3a9ffc648dc8dda5e1ab6acd48173edab
Related-PROD: PROD-19112
diff --git a/cassandra/backup.sls b/cassandra/backup.sls
index ba217f3..fd1cacd 100644
--- a/cassandra/backup.sls
+++ b/cassandra/backup.sls
@@ -145,6 +145,14 @@
     - user: cassandra_user
     - pkg: cassandra_backup_server_packages
 
+{{ backup.backup_dir }}/.ssh:
+  file.directory:
+  - mode: 700
+  - user: cassandra
+  - group: cassandra
+  - require:
+    - user: cassandra_user
+
 {{ backup.backup_dir }}/.ssh/authorized_keys:
   file.managed:
   - user: cassandra
@@ -153,6 +161,7 @@
   - source: salt://cassandra/files/backup/authorized_keys
   - require:
     - file: {{ backup.backup_dir }}/full
+    - file: {{ backup.backup_dir }}/.ssh
 
 cassandra_server_script:
   file.managed: