Revert "skip test_snapshot_pattern in master"

This reverts commit aa4c05d886.

Change-Id: I854b450800877ddfad120b5cdd1b5a00353e4e47
Depends-On: https://review.opendev.org/#/c/752187/
Related-Bug: #1895601

roles/validate-tempest/vars/tempest_skip.yml

@@ -1372,12 +1372,6 @@ known_failures:
         lp: 'https://bugs.launchpad.net/tripleo/+bug/1895441'
     jobs:
       - 'puppet-nova-tripleo-standalone'
-  - test: 'tempest.scenario.test_snapshot_pattern.TestSnapshotPattern'
-    deployment: 'overcloud'
-    releases:
-      - name: 'master'
-        reason: '500 error, oslo db connection error'
-        lp: 'https://bugs.launchpad.net/tripleo/+bug/1895601'
   - test: 'octavia_tempest_plugin.tests.scenario.v2.test_load_balancer.LoadBalancerScenarioTest.test_load_balancer_ipv4_CRUD'
     deployment: 'overcloud'
     releases: