MNAIO: Inject the host ssh public key into the image

To allow a downloaded set of file-backed images to be used on
another host, the new host's public ssh key needs to be injected
into the VM disks so that ansible is able to connect to it and
complete the rest of the preparation.

Change-Id: I6b9b5efb88283417c15f74f40cfb91943bb8774d

multi-node-aio/playbooks/deploy-vms.yml

@@ -118,6 +118,22 @@
             - hostvars[item]['server_vm'] | default(false) | bool
           with_items: "{{ groups['pxe_servers'] }}"
 
+        # Note (odyssey4me):
+        # This will only work on a host which has
+        # libguestfs >= 1.35.2 and >= 1.34.1
+        # Ubuntu bionic works, but xenial does not (even with UCA).
+        # ref: https://bugs.launchpad.net/ubuntu/+source/libguestfs/+bug/1615337.
+        - name: Inject the host ssh key into the VM disk image
+          command: >-
+            virt-sysprep
+            --enable customize
+            --ssh-inject root:file:/root/.ssh/id_rsa.pub
+            --add {{ _virt_pools.pools.default.path | default('/data/images') }}/{{ hostvars[item]['server_hostname'] }}.img
+          when:
+            - vm_use_snapshot | bool
+            - hostvars[item]['server_vm'] | default(false) | bool
+          with_items: "{{ groups['pxe_servers'] }}"
+
     - name: Wait for guest capabilities to appear
       command: "virsh capabilities"
       register: virsh_caps

multi-node-aio/playbooks/vars/ubuntu.yml

@@ -34,6 +34,7 @@ mnaio_host_distro_packages:
   - bridge-utils
   - ifenslave
   - iptables-persistent
+  - libguestfs-tools
   - libvirt-bin
   - lvm2
   - ntp