Update test dependencies

This commit installs libffi-dev on neutron hosts, and updates the nova
test dependencies to install on all nova hosts.  This is not causing
gate failures as I believe these packages may already be installed on
the host, and they already exist in containers which is why they do not
fail there.

Change-Id: I5a74b313642a1b1c5a6ae8dcb2b883d920b68134

tests/test-install-neutron.yml

@@ -18,6 +18,14 @@
   user: root
   gather_facts: true
   pre_tasks:
+    # NOTE: These are typically installed in the repo server where we build the
+    #       neutron wheel
+    - name: Install packages required to build neutron python package
+      apt:
+        name: "{{ item }}"
+      with_items:
+        - libffi-dev
+      when: inventory_hostname in groups['neutron_all']
     - name: Ensure rabbitmq vhost
       rabbitmq_vhost:
         name: "{{ neutron_rabbitmq_vhost }}"

tests/test-install-nova.yml

@@ -29,7 +29,7 @@
         - libffi-dev
         - pkg-config
         - libvirt-dev
-      when: inventory_hostname in groups['nova_compute']
+      when: inventory_hostname in groups['nova_all']
     - name: Ensure rabbitmq vhost
       rabbitmq_vhost:
         name: "{{ nova_rabbitmq_vhost }}"