Wait for guest capabilities to appear

Deploying the multi-node-aio from master on a machine running Ubuntu
14.04 fails frequently as libvirt doesn't think it has the hvm
OS type.  I was able to manually run "virsh capabilities" shortly after
libvirt was installed and sure enough it didn't list any guest
capabilities.  Subsequent runs of "virsh capabilities" then returned
the <guest> XML element w/ <os_type>hvm</os_type> defined.

This commit simply adds a task that checks "virsh capabilities",
retrying up to 6 times if the <guest> element is not present.  From my
limit testing this seems sufficient to ensure that the domains are
defined and created successfully.

Lastly, we add a task to create /etc/libvirt/storage which is expected
to exist, but doesn't on a 14.04 deployment.

Change-Id: I158987270b71d3781e91d819fdcb02da736f3c1d

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

@@ -49,6 +49,16 @@
         - 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
+      until: "'<guest>' in virsh_caps.stdout"
+      retries: 6
+      delay: 10
+      when:
+        - hostvars[item]['server_vm'] | default(false) | bool
+      with_items: "{{ groups['pxe_servers'] }}"
+
     - name: Define the VM
       command: "virsh define /etc/libvirt/qemu/{{ hostvars[item]['server_hostname'] }}.xml"
       failed_when: false

multi-node-aio/playbooks/setup-host.yml

@@ -198,6 +198,11 @@
       failed_when: false
       register: virsh_data_volume
 
+    - name: Create /etc/libvirt/storage directory
+      file:
+        path: "/etc/libvirt/storage/"
+        state: "directory"
+
     - name: Create virsh data volume
       shell: |
         virsh pool-create-as vg01 logical