Test validate-host role

Add validate-host to our zuul role integration job. This will allow us
to test changes to the validate host role and be more confident in
making those changes.

Depends-On: https://review.openstack.org/563790
Change-Id: If2db235d143e3edace75db724928c9e482720b93

tests/base.yaml

@@ -10,4 +10,5 @@
 - include: mirror-info.yaml
 - include: configure-mirrors.yaml
 - include: fetch-zuul-cloner.yaml
+- include: validate-host.yaml
 

tests/validate-host.yaml

@@ -0,0 +1,13 @@
+- name: Test the validate-host role
+  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'
+  hosts: all
+  roles:
+    - role: validate-host
+      zuul_site_traceroute_host: git.openstack.org

zuul.d/jobs.yaml

@@ -26,6 +26,7 @@
       - ^roles/mirror-info/.*
       - ^roles/set-zuul-log-path-fact/.*
       - ^roles/use-cached-repos/.*
+      - ^roles/validate-host/.*
       - ^tests/.*
 
 - job: