Add collect and upload log roles

Change-Id: Id12fb552f81e7eda9992694250582823be2c1a3c

roles/collect-logs/tasks/main.yaml

@@ -0,0 +1,6 @@
+- name: Collect logs from remote hosts.
+  synchronize:
+    dest: "{{ zuul.executor.log_root }}"
+    mode: pull
+    src: "logs/"
+  no_log: true

roles/upload-logs/tasks/main.yaml

@@ -0,0 +1,15 @@
+- name: Set log path for a change.
+  when: zuul.change
+  set_fact:
+    log_path: "{{ zuul.change[:-2] }}/{{ zuul.change }}/{{ zuul.patchset }}/{{ zuul.pipeline }}/{{ zuul.uuid[:7] }}/"
+
+- name: Set log path for a ref update.
+  when: zuul.newrev
+  set_fact:
+    log_path: "{{ zuul.newrev[:-2] }}/{{ zuul.newrev }}/{{ zuul.pipeline }}/{{ zuul.uuid[:7] }}/"
+
+- name: Upload logs to log server.
+  synchronize:
+    src: "{{ zuul.executor.log_root }}"
+    dest: "{{ log_path }}"
+  no_log: true