Migrate templates job to Zuul v3

Migrate templates job to zuul v3.
Migrating guideline:
https://docs.openstack.org/infra/manual/zuulv3.html

Needed-By: I096b406389f610b503649ee8a4b5067d3f2dec5e
Change-Id: I5bfa473e265fc1dea79adb98dfc06d7c7058f84c

.zuul.yaml

@@ -0,0 +1,19 @@
+- job:
+    name: heat-templates-check
+    parent: legacy-dsvm-base
+    run: playbooks/devstack/run.yaml
+    post-run: playbooks/devstack/post.yaml
+    timeout: 7500
+    required-projects:
+      - openstack-infra/devstack-gate
+      - openstack/heat
+      - openstack/heat-templates
+
+- project:
+    name: openstack/heat-templates
+    check:
+      jobs:
+        - heat-templates-check
+    gate:
+      jobs:
+        - heat-templates-check

playbooks/devstack/post.yaml

@@ -0,0 +1,15 @@
+- hosts: primary
+  tasks:
+
+    - name: Copy files from {{ ansible_user_dir }}/workspace/ on node
+      synchronize:
+        src: '{{ ansible_user_dir }}/workspace/'
+        dest: '{{ zuul.executor.log_root }}'
+        mode: pull
+        copy_links: true
+        verify_host: true
+        rsync_opts:
+          - --include=/logs/**
+          - --include=*/
+          - --exclude=*
+          - --prune-empty-dirs

playbooks/devstack/run.yaml

@@ -0,0 +1,54 @@
+- hosts: all
+  name: job for templates-devstack
+  tasks:
+
+    - name: Ensure legacy workspace directory
+      file:
+        path: '{{ ansible_user_dir }}/workspace'
+        state: directory
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          cat > clonemap.yaml << EOF
+          clonemap:
+            - name: openstack-infra/devstack-gate
+              dest: devstack-gate
+          EOF
+          /usr/zuul-env/bin/zuul-cloner -m clonemap.yaml --cache-dir /opt/git \
+              git://git.openstack.org \
+              openstack-infra/devstack-gate
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          cat << 'EOF' >>"/tmp/dg-local.conf"
+          [[local|localrc]]
+          enable_plugin heat git://git.openstack.org/openstack/heat
+          EOF
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'
+
+    - shell:
+        cmd: |
+          set -e
+          set -x
+          export PYTHONUNBUFFERED=true
+          export DEVSTACK_GATE_TEMPEST=0
+          export DEVSTACK_GATE_EXERCISES=0
+          function post_test_hook {
+              cd $BASE/new/heat-templates/tools
+              ./post_test_hook.sh
+          }
+          export -f post_test_hook
+          cp devstack-gate/devstack-vm-gate-wrap.sh ./safe-devstack-vm-gate-wrap.sh
+          ./safe-devstack-vm-gate-wrap.sh
+        executable: /bin/bash
+        chdir: '{{ ansible_user_dir }}/workspace'
+      environment: '{{ zuul | zuul_legacy_vars }}'

tools/validate-templates

@@ -1,12 +1,11 @@
 #!/usr/bin/env python
 
 import os
-import re
 import subprocess
 import sys
 
 
-EXCLUDED_DIRS = ('contrib', 'elements', 'invalid')
+EXCLUDED_DIRS = ('contrib', 'elements', 'invalid', 'playbooks')
 
 
 def main(args):
@@ -20,7 +19,8 @@ def main(args):
             if excluded in dirs:
                 dirs.remove(excluded)
         for name in files:
-            if name.endswith((".yaml", ".template")):
+            if name.endswith((".yaml", ".template")
+                             ) and not name == ".zuul.yaml":
                 got_error = validate(root, name) or got_error
     sys.exit(int(got_error))