Add native Zuul v3 buildimages jobs

Native Zuul v3 jobs for the image building tests, which matches
the existing jobs.

Change-Id: I0485093a87d9cc905682fdb8886fa44228525e87

.zuul.yaml

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+- project:
+    name: openstack/sahara-image-elements
+    check:
+      jobs:
+        - sahara-image-elements-buildimages-ambari:
+            voting: false
+        - sahara-image-elements-buildimages-cloudera:
+            voting: false
+        - sahara-image-elements-buildimages-mapr:
+            voting: false
+        - sahara-image-elements-buildimages-plain:
+            voting: false
+        - sahara-image-elements-buildimages-spark:
+            voting: false
+        - sahara-image-elements-buildimages-storm:
+            voting: false
+        - sahara-image-elements-buildimages-vanilla:
+            voting: false
+
+- job:
+    name: sahara-image-elements-buildimages-basejob
+    timeout: 5400
+    run: playbooks/buildimages/run
+
+- job:
+    name: sahara-image-elements-buildimages-ambari
+    parent: sahara-image-elements-buildimages-basejob
+    vars:
+      sahara_plugin: ambari
+
+- job:
+    name: sahara-image-elements-buildimages-cloudera
+    parent: sahara-image-elements-buildimages-basejob
+    vars:
+      sahara_plugin: cloudera
+
+- job:
+    name: sahara-image-elements-buildimages-mapr
+    parent: sahara-image-elements-buildimages-basejob
+    vars:
+      sahara_plugin: mapr
+
+- job:
+    name: sahara-image-elements-buildimages-plain
+    parent: sahara-image-elements-buildimages-basejob
+    vars:
+      sahara_plugin: plain
+
+- job:
+    name: sahara-image-elements-buildimages-spark
+    parent: sahara-image-elements-buildimages-basejob
+    vars:
+      sahara_plugin: spark
+
+- job:
+    name: sahara-image-elements-buildimages-storm
+    parent: sahara-image-elements-buildimages-basejob
+    vars:
+      sahara_plugin: storm
+
+- job:
+    name: sahara-image-elements-buildimages-vanilla
+    parent: sahara-image-elements-buildimages-basejob
+    vars:
+      sahara_plugin: vanilla

playbooks/buildimages/run.yaml

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+- hosts: all
+  roles:
+    - build-sahara-images-dib

roles/build-sahara-images-dib/README.rst

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+Build Sahara Images with DIB
+
+**Role Variables**
+
+.. zuul:rolevar:: sahara_build_directory
+   :default: /var/tmp/sahara-image-build
+
+   The base directory used for the build process.
+
+.. zuul:rolevar:: sahara_plugin
+   :default: vanilla
+
+   The plugin whose images will be built.

roles/build-sahara-images-dib/defaults/main.yaml

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+---
+sahara_build_directory: /var/tmp/sahara-image-build
+sahara_plugin: vanilla

roles/build-sahara-images-dib/tasks/main.yaml

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+- name: Build all the images for the selected plugin
+  command: ./tools/gate/build-images "{{ sahara_plugin }}"
+  args:
+    chdir: "{{ zuul.project.src_dir }}"