Merge branch 'OSImageBugfix' into 'master'

add a role for OpenStackImageBugfixs

See merge request !495

roles/OSImageBugfix/tasks/main.yml

+---
+# This role is to  fix a misconfiguration of some OpenStack Base images at Monash University. 
+# the misconfiguration is dev/vdb mounted in fstab of the Image and the Openstack Flavour not providing a second disk.
+- name: unmount vdb if absent
+  mount:
+    path: "/mnt"
+    src: "/dev/vdb"
+    state: absent
+  become: true
+  when: 'hostvars[inventory_hostname]["ansible_devices"]["vdb"] is not defined'
+
+- name: keep mnt present
+  file:
+    path: "/mnt"
+    owner: root
+    group: root
+    mode: "u=rwx,g=rx,o=rx"
+    state: directory
+  become: true
+  when: 'hostvars[inventory_hostname]["ansible_devices"]["vdb"] is not defined'