Add Bionic testing

Now that bionic testing is added into the tests repos, we can
start testing it in the repo.

Depends-On: https://review.openstack.org/566959
Depends-On: https://review.openstack.org/567032
Depends-On: https://review.openstack.org/567034
Depends-On: https://review.openstack.org/567038
Depends-On: https://review.openstack.org/567045
Change-Id: I8473f203a67b8128712b9aacdf194b1faa7cdc51

meta/main.yml

@@ -23,6 +23,7 @@ galaxy_info:
     - name: Ubuntu
       versions:
         - xenial
+        - bionic
     - name: EL
       versions:
         - 7

tests/test.yml

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 - name: Prepare the host/containers
-  include: common/test-setup-host.yml
+  import_playbook: common/test-setup-host.yml
 
 - name: Verify building on a web server, and installing using a URL
   import_playbook: test-functional.yml