Merge "Add test-emit-job-header roles"

roles/test-emit-job-header/README.rst

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+Log a few lines about the job.
+
+**Role Variables**
+
+.. zuul:rolevar:: zuul_log_url
+
+   Base URL where logs are to be found.

roles/test-emit-job-header/tasks/main.yaml

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+# We don't want this to run for every host, it should only run once.
+- run_once: yes
+  block:
+    - name: Setup log path fact
+      include_role:
+        name: set-zuul-log-path-fact
+
+    - name: Print job information
+      debug:
+        msg: |
+          # Job Information
+          Ansible Version: {{ ansible_version['full'] }}
+          Job: {{ zuul.job }}
+          Pipeline: {{ zuul.pipeline }}
+          Executor: {{ zuul.executor.hostname }}
+          {% if zuul.change_url is defined %}
+          Triggered by: {{ zuul.change_url }}
+          {% endif %}
+          {% if zuul_log_url is defined and zuul_log_path is defined %}
+          Log URL (when completed): {{ zuul_log_url }}/{{ zuul_log_path }}
+          {% endif %}