Fix role gate tests for Ansible 2.3

Add 'become' and root 'user' options to the playbook instead of using
'ansible_become' through an inventory variable.

Change-Id: Ifc29eba5fe3de8b29a322a35501919074e948be9

tests/inventory

@@ -1,5 +1,5 @@
 [all]
-localhost ansible_host=127.0.0.1 ansible_become=True
+localhost
 test1 ansible_host=127.111.111.101 ansible_become=True
 test2 ansible_host=127.111.111.102 ansible_become=True
 test3 ansible_host=127.111.111.103 ansible_become=True

tests/test.yml

@@ -13,11 +13,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Add some data to use for verification later
 - name: Playbook for test setup
   hosts: localhost
   connection: local
+  become: true
   gather_facts: false
-  tasks:
+  pre_tasks:
     - name: Add entries to hosts file
       blockinfile:
         dest: /etc/hosts
@@ -27,11 +29,15 @@
           127.111.111.103 test3.additional
         marker: ""
 
-- include: "common/test-install-openstack-hosts.yml"
+# Prepare the user ssh keys
+- include: common/test-prepare-keys.yml
+
+# Execute the role
+- include: common/test-install-openstack-hosts.yml
 
 - name: Playbook for role testing
   hosts: localhost
-  connection: local
+  become: true
   gather_facts: true
   tasks:
     - name: Open modules file