Unskip bootvolumepattern from master

Boot volume pattern tests was in skip list from very long time
in order to fix the issue, we need to unskip it and add it in
os_tempest role and tests so that if it fails again we can
design a logstash elastic search query to fix it.

https://tree.taiga.io/project/tripleo-ci-board/task/791

Change-Id: I87b90a90d9258fbf40a2b9ea5344a8347b1ad076
Related-Bug: 1802971

roles/validate-tempest/vars/tempest_skip_master.yml

@@ -133,9 +133,6 @@ known_failures:
   - test: 'neutron_tempest_plugin.api.admin.test_l3_agent_scheduler'
     reason: 'neutron tempest tests are failing by giving 503 Service Unavailable'
     lp: 'https://bugs.launchpad.net/tripleo/+bug/1793482'
-  - test: 'tempest.scenario.test_volume_boot_pattern.TestVolumeBootPattern'
-    reason: 'neutron '
-    lp: 'https://bugs.launchpad.net/tripleo/+bug/1802971'
   - test: 'tempest.api.compute.servers.test_attach_interfaces.AttachInterfacesUnderV243Test.test_add_remove_fixed_ip'
     reason: 'Got error: Class PyRoute2 cannot be found '
     lp: 'https://bugs.launchpad.net/tripleo/+bug/1810325'