Create Junit XML Report from tempest run

Tempest results are currently written to stdout as part of a test run.
This output is difficult to parse. This patch adds steps to generate an
XML report, and make this report available in /tmp on a physical host.

The report is copied to a physical host so that external systems that do
not have knowledge of the container inventory can retrieve the report,
for example Jenkins.

* Add pip packages python-subunit and junitxml to tempest venv, needed
  to convert the subunit stream stored in testrepository to junit XML.

* openstack_tempest_gate:
    After a tempest run completes, the subunit stream is extracted from
    the testrepository, converted to junit XML and written to /tmp in
    the utility container running the tests.

* run-tempest.sh
    After running openstack_tempest_gate, retrieve XML results and write
    them to /tmp on the host.

Change-Id: I897024f545dd2a90f80b0d5c0aa558f335dc963a
Closes-Bug: #1464686

playbooks/roles/os_tempest/defaults/main.yml

@@ -91,6 +91,8 @@ tempest_pip_packages:
   - testrepository
   - testscenarios
   - testtools
+  - python-subunit
+  - junitxml
 
 tempest_image_dir: "/opt/images"
 tempest_images:

playbooks/roles/os_tempest/templates/openstack_tempest_gate.sh.j2

@@ -185,6 +185,14 @@ echo "Using test list $test_list_summary"
 # execute chosen tests with pretty output
 ./run_tempest.sh --no-virtual-env ${RUN_TEMPEST_OPTS} -- --load-list test_list ${TESTR_OPTS};
 result=$?
+
+# Create junit xml report from test results
+subunit-1to2 < .testrepository/0 | subunit2junitxml > tempest_results.xml
+cp tempest_results.xml /tmp
+if [ -d "/var/log/utility" ];then
+  # Copy the log to the utility logging directory
+  cp tempest_results.xml /var/log/utility/tempest_results_$(date +%Y%d%m-%H%M%S).xml
+fi
 popd
 
 if [[ $result == 0 ]]; then

scripts/run-tempest.sh

@@ -50,4 +50,8 @@ pushd playbooks
   ansible 'utility[0]' -m shell -a "export RUN_TEMPEST_OPTS=${RUN_TEMPEST_OPTS}; \
                                     export TESTR_OPTS=${TESTR_OPTS}; \
                                     ${TEMPEST_SCRIPT_PATH} ${TEMPEST_SCRIPT_PARAMETERS}"
+
+  # Retrieve tempest test results
+  ansible 'utility[0]' -m fetch -a 'src=/tmp/tempest_results.xml dest=/tmp/ flat=true'
+
 popd