Allow to run tests outside openstack infra

The task run un-conditionally and the shell script
just echo empty strings which are then used for
ALL the deploys, breaking up deployments with wrong
repo urls.

Change-Id: Ia42a400a7729efa7e6b564c83d2de047a4f26887

common-tasks/test-set-nodepool-vars.yml

@@ -13,6 +13,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Ensure ci data exists before setting variables.
+  stat:
+    path: /etc/ci/mirror_info.sh
+  register: ci_mirror_info
+
+- name: Set nodepool vars
+  block:
     - name: Discover variables from OpenStack's CI environment when in nodepool
       shell: |
         source /etc/ci/mirror_info.sh
@@ -49,3 +56,4 @@
         pip_links:
           - name: "infra_wheel_mirror"
             link: "{{ pip_wheel_mirror }}"
+  when: ci_mirror_info.stat.exists