tests: just directly rsync files

Using the synchronize module made rsync try to fetch the files from the
VM, even though we were part of the delegated block. Might be a subtle
bug in ansible. But really, there's no point in using the module here.
Both src and dest are local, so we can just call rsync ourselves.

tests/tests.yml

@@ -79,9 +79,5 @@
             chdir: "{{srcdir}}"
 
         always:
-        - name: fetch vmcheck results
-          synchronize:
-            src: "{{srcdir}}/vmcheck/"
-            dest: "{{artifacts}}/vmcheck"
-            mode: pull
-            delete: yes
+        - name: Fetch test results
+          command: rsync -a --delete {{srcdir}}/vmcheck/ {{artifacts}}/vmcheck