Promote base-test to bast for ipv6 DNS fixes

This promotes https://review.openstack.org/557505/ to gather the
network ansible variables needed for configure-unbound role.

http://logs.openstack.org/67/549867/1/check/openstack-zuul-jobs-linters/60cb81c/job-output.txt.gz#_2018-03-28_21_43_26_651991

Change-Id: I68f5c3c7a1f2c582ac5f7b8b555b40e1cf4feb1a
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

playbooks/base-test/pre.yaml

@@ -5,6 +5,10 @@
 
 - hosts: all
   pre_tasks:
+    # NOTE(pabelanger): Until we hit the validate-host role, we have a minimal
+    # set of ansible variables collected by zuul-executor. This doesn't include
+    # network variables (ansible_default_ipv4 / ansible_default_ipv6) so gather
+    # these variables as they are important to the configure-unbound role.
     - name: Gather network facts
       setup:
         gather_subset: 'network'

playbooks/base/pre.yaml

@@ -4,6 +4,15 @@
       zuul_log_url: "http://logs.openstack.org"
 
 - hosts: all
+  pre_tasks:
+    # NOTE(pabelanger): Until we hit the validate-host role, we have a minimal
+    # set of ansible variables collected by zuul-executor. This doesn't include
+    # network variables (ansible_default_ipv4 / ansible_default_ipv6) so gather
+    # these variables as they are important to the configure-unbound role.
+    - name: Gather network facts
+      setup:
+        gather_subset: 'network'
+
   roles:
     - add-build-sshkey
     - start-zuul-console