Ceph: mount mon state directory on host.

This change allows single node deployments of ceph to reboot/restart
sucessfully.

Change-Id: I9e8b7c5fa6c769483294071b9ed17db6e51eda1f

ceph/templates/daemonset-mon.yaml

@@ -53,6 +53,9 @@ spec:
             - name: pod-var-lib-ceph
               mountPath: /var/lib/ceph
               readOnly: false
+            - name: mon-directory
+              mountPath: /var/lib/ceph/mon
+              readOnly: false
             - name: pod-run
               mountPath: /run
               readOnly: false
@@ -143,6 +146,9 @@ spec:
             - name: pod-var-lib-ceph
               mountPath: /var/lib/ceph
               readOnly: false
+            - name: mon-directory
+              mountPath: /var/lib/ceph/mon
+              readOnly: false
             - name: pod-run
               mountPath: /run
               readOnly: false
@@ -160,6 +166,9 @@ spec:
         - name: pod-run
           emptyDir:
             medium: "Memory"
+        - name: mon-directory
+          hostPath:
+            path: {{ .Values.ceph.storage.mon_directory }}
         - name: ceph-client-admin-keyring
           secret:
             secretName: {{ .Values.secrets.keyrings.admin }}