Fix bifrost CI

Bifrost's CI is broken by two items:

Ansible 2.5's pause module seems to be
more syntax strict, and we might have been
missing the pause logic all along due to the
when being down a level too far in the yaml.

Additionally, fedora core 26 support in CI
is no longer available, and as such disabling
for the time being.

This should fix CI.

Change-Id: I37df36d5f1bf13c833feda9e0a7f0a288a18a097

playbooks/test-bifrost.yaml

@@ -165,7 +165,7 @@
   - name: Wait 30 seconds
     pause:
       seconds: 30
-      when: inventory_dhcp | bool == true
+    when: inventory_dhcp | bool == true
 
 - hosts: localhost
   connection: local

zuul.d/project.yaml

@@ -2,7 +2,9 @@
     check:
       jobs:
         - bifrost-integration-tinyipa
-        - bifrost-integration-tinyipa-fedora26
+        # TODO Broken becasuse FC26 is no longer an option in
+        # OpenStack CI
+        # - bifrost-integration-tinyipa-fedora26
         - bifrost-integration-tinyipa-opensuse-423
         # Non-voting jobs
         - bifrost-integration-dhcp:
@@ -23,6 +25,6 @@
     gate:
       jobs:
         - bifrost-integration-tinyipa
-        - bifrost-integration-tinyipa-fedora26
+        # - bifrost-integration-tinyipa-fedora26
         - bifrost-integration-tinyipa-opensuse-423
         - openstack-tox-lower-constraints