Fix default start time for cron job to execute 1 time per day

  Currently we have a situation on prod envs with current defaults
  for backup crontab "* 2 * * *". As a result - 60 backups per day
  during 2AM-3AM.
  This leads to partition overfilling and possible backup script
  iteration intersection (previous or next launch can
  be blocked/corrupted by previous/next launch).

  Related-Bug: PROD-23665 (PROD:23665)

Change-Id: Ifc1b659a75d148631fb92fa33bec5399d30c0b19
diff --git a/ceph/backup.sls b/ceph/backup.sls
index e590490..7963e5c 100644
--- a/ceph/backup.sls
+++ b/ceph/backup.sls
@@ -63,6 +63,7 @@
   - hour: 2
 {%- endif %}
 {%- else %}
+  - minute: 0
   - hour: 2
 {%- endif %}
   - require:
@@ -163,6 +164,7 @@
   - hour: 2
 {%- endif %}
 {%- else %}
+  - minute: 0
   - hour: 2
 {%- endif %}
   - require: