Add new image for tempest

Note, this image is slightly different to most others in Kolla in that
it's not a service designed to be deployed via Ansible. It's more a
'tool' type image that is spun up when needed.

Partially-Implements: blueprint tempest-gate

Change-Id: I1877c03d0804e57d274044aecb1055f847025bec

docker/tempest/Dockerfile.j2

+FROM {{ namespace }}/{{ image_prefix }}openstack-base:{{ tag }}
+MAINTAINER {{ maintainer }}
+
+{% if install_type == 'binary' %}
+    {% if base_distro in ['fedora', 'centos', 'oraclelinux', 'rhel'] %}
+
+RUN yum -y install \
+        openstack-tempest \
+    && yum clean all
+
+    {% endif %}
+{% elif install_type == 'source' %}
+
+ADD tempest-archive /tempest-source
+RUN ln -s tempest-source/* tempest \
+    && pip --no-cache-dir install -c requirements/upper-constraints.txt /tempest \
+    && mkdir -p /etc/tempest /var/log/tempest /etc/tempest/tempest_lock
+
+{% endif %}
+
+{{ include_footer }}

etc/kolla/kolla-build.conf

@@ -142,6 +142,10 @@ location = http://github.com/kanaka/noVNC/tarball/v0.5.1
 type = url
 location = http://tarballs.openstack.org/swift/swift-master.tar.gz
 
+[tempest]
+type = url
+location = http://tarballs.openstack.org/tempest/tempest-master.tar.gz
+
 [zaqar]
 type = url
 location = http://tarballs.openstack.org/zaqar/zaqar-master.tar.gz