software/cloudooo/test: make test more robust

Sometimes backends process less than 15% of requests. For this test to
test that the requests are distributed on all backends, testing that
each backend process at least one request should be enough.

software/cloudooo/test/test.py

@@ -307,8 +307,8 @@ class TestLibreOfficeCluster(CloudOooTestCase):
       # ideally there should be 25% of requests on each backend, because we use
       # round robin scheduling, but it can happen that some backend take longer
       # to start, so we are tolerant here and just check that each backend
-      # process at least 15% of requests. 
-      self.assertGreater(total_hrsp_2xx[backend], 15)
+      # process at least one request.
+      self.assertGreater(total_hrsp_2xx[backend], 0)
     # no errors
     total_eresp = {
         line['svname']: int(line['eresp'] or 0)