Do not zap disks on monitors

We don't necessary want to wipe and delete partition of the disks on the
monitor nodes, so we simply perform the operation on the OSD nodes.

Signed-off-by: Sébastien Han <seb@redhat.com>

purge-cluster.yml

@@ -6,22 +6,8 @@
   - mons
   - osds
 
-  vars:
-    devices: [ '/dev/sdb', '/dev/sdc', '/dev/sdd', '/dev/sde', '/dev/sdf' ]
-    partitions: [ '1', '2', '3' ]
-
   tasks:
 
-  - name: disk zap
-    command: /usr/sbin/sgdisk --zap-all --clear --mbrtogpt -g -- {{ item }}
-    with_items: devices
-    failed_when: false
-
-  - name: disk zap
-    command: /usr/sbin/sgdisk --zap-all --clear --mbrtogpt -g -- {{ item }}
-    with_items: devices
-    failed_when: false
-
   - name: purge ceph
     command: ceph-deploy purge {{ ansible_fqdn }}
     delegate_to: 127.0.0.1
@@ -34,5 +20,24 @@
     command: ceph-deploy purgedata {{ ansible_fqdn }}
     delegate_to: 127.0.0.1
 
+- hosts:
+  - osds
+
+  vars:
+    devices: [ '/dev/sdb', '/dev/sdc', '/dev/sdd', '/dev/sde', '/dev/sdf' ]
+    partitions: [ '1', '2', '3' ]
+
+  tasks:
+
+  - name: disk zap
+    command: /usr/sbin/sgdisk --zap-all --clear --mbrtogpt -g -- {{ item }}
+    with_items: devices
+    failed_when: false
+
+  - name: disk zap again
+    command: /usr/sbin/sgdisk --zap-all --clear --mbrtogpt -g -- {{ item }}
+    with_items: devices
+    failed_when: false
+
   - name: call partprobe
     command: partprobe