Compress testrepository.subunit in fetch-testr-output

It make sense to compress subunit file we want from tox before
uploading it to our log server.

Change-Id: Ibb1b6cedce0350f8c2baf40718a909f30ce954d7
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

roles/fetch-testr-output/tasks/main.yaml

@@ -1,3 +1,14 @@
+- name: Register subunit file
+  stat:
+    path: "{{ zuul_work_dir }}/testrepository.subunit"
+  register: p
+
+- name: Compress subunit file to archive to logs server
+  archive:
+    path: "{{ p.stat.path }}"
+  when:
+    - p.stat.exists
+
 - name: Collect test-results
   synchronize:
     dest: "{{ zuul.executor.log_root }}"

roles/tox/tasks/main.yaml

@@ -39,7 +39,6 @@
             $bin_path/testr last --subunit > ./testrepository.subunit
         fi
         /usr/os-testr-env/bin/subunit2html ./testrepository.subunit testr_results.html
-        gzip -9 ./testrepository.subunit
         gzip -9 ./testr_results.html
 
         rancount=$($bin_path/testr last | sed -ne 's/Ran \([0-9]\+\).*tests in.*/\1/p')