Switch to using standalone role for image building

Building an undercloud image was not part of the spec
for importing tripleo-quickstart. However, it is crucial
for the CI that runs in RDO. Eventually, we should move
the playbook responsible for image building out of this
repo as well, but for now we just externalize the role
it uses via ansible-galaxy.

Change-Id: If440d25c0d1687fd9bfc9d78ae35a4547b6866e0

ansible-role-requirements.yml

@@ -0,0 +1,5 @@
+- name: image-build
+  src: https://github.com/redhat-openstack/ansible-role-tripleo-image-build
+  scm: git
+  version: master
+

playbooks/build-images.yml

@@ -13,7 +13,15 @@
   hosts: virthost
   gather_facts: yes
   roles:
-    - images/build
+    - parts/kvm
+    - parts/libvirt
+    # TODO(trown): It is not ideal that we need to set this
+    # variable directly on the role. However, we have the
+    # same variable used in the tripleo-quickstart roles
+    # with a different meaning. We should namespace the
+    # variables better so that they can both be set separately
+    # in a config file or extra-vars passed to ansible.
+    - { role: "image-build", working_dir: "/var/lib/oooq-images" }
 
 - name: Publish Images
   hosts: virthost

requirements.txt

@@ -1,5 +1,5 @@
 pbr>=1.6
 # ansible is pretty fragile, so we pin to an exact known good
 # release
-ansible==2.0.0
+ansible>=2.0.1
 netaddr>=0.7.18