workaround. vms not been removed in conntrack testcases

workaround. Conntrack testcases fail randomly because one vm is
not deleted when the testcase fails. I have seen that it may
be related to the code in which conntrack table is got from the
hypervisor (removing that code, the problem does not happen
again). Including this sleep between that code and the end
of the testcase in which it will start vm removal seems to solve
the issue

Change-Id: I63975f95b0ec190c4aee09924fdadce89dab4855

nfv_tempest_plugin/tests/scenario/test_nfv_offload.py

@@ -670,6 +670,15 @@ def run_offload_testcase(self, test, protocol,
                                                        offload_injection_time,
                                                        tcpdump_time)
 
+        # workaround. Conntrack testcases fail randomly because one vm is
+        # not deleted when the testcase fails. I have seen that it may
+        # be related to the code in which conntrack table is got from the
+        # hypervisor (removing that code, the problem does not happen
+        # again). Including this sleep between that code and the end
+        # of the testcase in which it will start vm removal seems to solve
+        # the issue
+        if sec_groups:
+            time.sleep(30)
         self.assertTrue(network_type_found, "Network type {} not "
                                             "found".format(network_type))
         self.assertTrue(len(errors_found) == 0, "\n".join(errors_found))