Migrate packstack to centos-7 dib

This is part of our effort to migrate from devstack-centos7 to
centos-7 dibs.

Change-Id: I4a3b6379823e4b102af1c22814edf1fd50787cc3
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

jenkins/jobs/packstack.yaml

@@ -1,13 +1,14 @@
 - job-template:
-    name: 'gate-packstack-integration-{scenario}-tempest-dsvm-{ostype}'
-    node: 'devstack-{ostype}'
+    name: 'gate-packstack-integration-{scenario}-tempest-{ostype}'
+    node: '{ostype}'
 
     builders:
       - print-template-name:
           template-name: "{template-name}"
       - link-logs
-      - puppet-prepare-node
       - gerrit-git-prep
+      - install-distro-packages
+      - puppet-prepare-node
       - shell: |
           #!/bin/bash -xe
           export SCENARIO={scenario}

jenkins/jobs/projects.yaml

@@ -5060,7 +5060,7 @@
 - project:
     name: packstack
     tarball-site: tarballs.openstack.org
-    ostype: centos7
+    ostype: centos-7
     scenario:
       - scenario001
       - scenario002
@@ -5068,7 +5068,7 @@
     jobs:
       - python-jobs
       - 'gate-{name}-releasenotes'
-      - 'gate-packstack-integration-{scenario}-tempest-dsvm-{ostype}'
+      - 'gate-packstack-integration-{scenario}-tempest-{ostype}'
 
 - project:
     name: pandaman

zuul/layout.yaml

@@ -642,13 +642,13 @@ project-templates:
 
   - name: packstack-integration-jobs
     check:
-      - gate-packstack-integration-scenario001-tempest-dsvm-centos7
-      - gate-packstack-integration-scenario002-tempest-dsvm-centos7
-      - gate-packstack-integration-scenario003-tempest-dsvm-centos7
+      - gate-packstack-integration-scenario001-tempest-centos-7
+      - gate-packstack-integration-scenario002-tempest-centos-7
+      - gate-packstack-integration-scenario003-tempest-centos-7
     gate:
-      - gate-packstack-integration-scenario001-tempest-dsvm-centos7
-      - gate-packstack-integration-scenario002-tempest-dsvm-centos7
-      - gate-packstack-integration-scenario003-tempest-dsvm-centos7
+      - gate-packstack-integration-scenario001-tempest-centos-7
+      - gate-packstack-integration-scenario002-tempest-centos-7
+      - gate-packstack-integration-scenario003-tempest-centos-7
 
   - name: puppet-beaker-jobs
     check:
@@ -1180,7 +1180,7 @@ jobs:
 
   # Packstack integration jobs should only run on master and stable/mitaka
   # onwards
-  - name: ^gate-packstack-integration-.*-tempest-dsvm-centos7$
+  - name: ^gate-packstack-integration-.*-tempest-centos-7$
     skip-if:
       - project: openstack/packstack
         all-files-match-any: