Add nodepool config check

Use the nodepool config validation environment to check that
system-config changes don't commit a bad nodepool configuration

Depends-On: I5d58648bca160d8afc81aae3d8daf0c7bd01c976
Change-Id: I32c69acede6187c61008970d4f3620a3ae121070

jenkins/jobs/infra.yaml

@@ -62,6 +62,19 @@
     publishers:
       - zuul-swift-upload-console-log
 
+- job:
+    name: gate-system-config-nodepool
+    node: 'bare-precise || bare-trusty'
+
+    builders:
+      - revoke-sudo
+      - gerrit-git-prep
+      - tox:
+          envlist: 'nodepool'
+
+    publishers:
+      - zuul-swift-upload-console-log
+
 # This is a non-standard docs job because it uses SCP instead of FTP
 - job-template:
     name: '{name}-ci-docs'

zuul/layout.yaml

@@ -4095,11 +4095,13 @@ projects:
       - gate-system-config-pep8
       - gate-system-config-bashate
       - gate-system-config-puppet-syntax
+      - gate-system-config-nodepool
       - gate-ci-docs
     gate:
       - gate-system-config-pep8
       - gate-system-config-bashate
       - gate-system-config-puppet-syntax
+      - gate-system-config-nodepool
       - gate-ci-docs
     post:
       - system-config-ci-docs