Comment 10 for bug 1855985

Combining it from https://bugs.launchpad.net/tripleo/+bug/1856016

http://logs.rdoproject.org/openstack-periodic-latest-released/opendev.org/openstack/tripleo-ci/master/periodic-tripleo-ci-centos-7-ovb-1ctlr_2comp-featureset020-train/7e12b11/logs/undercloud/var/log/tempest/tempest_run.log.txt.gz

tempest.scenario.test_security_groups_basic_ops.TestSecurityGroupsBasicOps.test_cross_tenant_traffic[compute,id-e79f879e-debb-440c-a7e4-efeda05b6848,network] -> Failed

AssertionError: Timed out waiting for 10.0.0.102 to become reachable from 10.0.0.117

It is also related to race condition.
@marios, May be decreasing the tempest concurrency might help to slow down the api call and increase the tempest run time. If it does not work, we can move it to skip list?