Delete duplicated broken tempest test

Test "test_unmanage_replicated_share_snapshot_with_no_replica" is
located in "replication" test suite. But, it does only
"snapshot unmanage" actions without any relations to "replication".
Also, it does not delete real snapshot resource, because
"manila snapshot" gets only unmanaged.
So, just remove above mentioned test as duplication that, moreover,
leads to resources orphanage and cleanup errors.

Change-Id: Ifc762a882a78159adacfe168a4edbe824178301a
Closes-Bug: #1599165
diff --git a/manila_tempest_tests/tests/api/admin/test_replication_actions.py b/manila_tempest_tests/tests/api/admin/test_replication_actions.py
index b5f9388..a8f5eb7 100644
--- a/manila_tempest_tests/tests/api/admin/test_replication_actions.py
+++ b/manila_tempest_tests/tests/api/admin/test_replication_actions.py
@@ -177,19 +177,3 @@
             lib_exc.Conflict,
             self.admin_client.unmanage_snapshot,
             snapshot_id=snapshot['id'])
-
-    @test.attr(type=[base.TAG_POSITIVE, base.TAG_API_WITH_BACKEND])
-    @testtools.skipUnless(CONF.share.run_manage_unmanage_snapshot_tests,
-                          'Manage/Unmanage Snapshot Tests are disabled.')
-    def test_unmanage_replicated_share_snapshot_with_no_replica(self):
-        """Unmanage a snapshot of the replicated share with no replica."""
-        share = self.create_share(size=2,
-                                  share_type_id=self.share_type["id"],
-                                  availability_zone=self.share_zone,
-                                  client=self.admin_client)
-
-        snapshot = self.create_snapshot_wait_for_active(
-            share["id"], client=self.admin_client)
-        self.admin_client.unmanage_snapshot(snapshot_id=snapshot['id'])
-        self.admin_client.wait_for_resource_deletion(
-            snapshot_id=snapshot['id'])