Re-enable tests that were disabled due to bug #1623576

Based on the information in the original bug reports,
it is likely that this is no longer an issue.

Change-Id: I75c21239d4ffef5771b4972a4d66852b7efb394e
diff --git a/designate_tempest_plugin/tests/scenario/v2/test_zones.py b/designate_tempest_plugin/tests/scenario/v2/test_zones.py
index ec7076c..393def7 100644
--- a/designate_tempest_plugin/tests/scenario/v2/test_zones.py
+++ b/designate_tempest_plugin/tests/scenario/v2/test_zones.py
@@ -87,7 +87,6 @@
         waiters.wait_for_zone_404(self.client, zone['id'])
 
     @decorators.attr(type='slow')
-    @decorators.skip_because(bug='1623576')
     @decorators.idempotent_id('ad8d1f5b-da66-46a0-bbee-14dc84a5d791')
     @testtools.skipUnless(
         config.CONF.dns.nameservers,
@@ -101,7 +100,6 @@
         waiters.wait_for_query(self.query_client, zone['name'], "SOA")
 
     @decorators.attr(type='slow')
-    @decorators.skip_because(bug='1623576')
     @decorators.idempotent_id('d13d3095-c78f-4aae-8fe3-a74ccc335c84')
     @testtools.skipUnless(
         config.CONF.dns.nameservers,