Unmount Ceph OSD disks as part of destroy

This seems to have got lost during repo split. Adding it back in now.

Change-Id: Ic0b0f5efb12eab58e7872b30611a39640dc44cc2
Closes-Bug: #1629224
(cherry picked from commit e1a2f99014a1aeb3697e8ec3c999cdc12380376b)

releasenotes/notes/unmount-ceph-osds-43b7b59685bff5b4.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Unmount Ceph OSD disks as part of 'kolla-ansible destroy'

tools/cleanup-host

@@ -42,6 +42,11 @@ fi
 echo "Creating a fstab backup..."
 sudo cp /etc/fstab /etc/fstab_backup
 
+echo "Unmounting Ceph OSD disks"
+for mount in $(mount | awk '/\/var\/lib\/ceph/ { print $3 }'); do
+    umount $mount
+done
+
 echo "Removing ceph references from fstab..."
 sudo sed -i '/\/var\/lib\/ceph\/osd\//d' /etc/fstab