Add blacklist client + smoke tests

Change-Id: I2b780f5bada2272f6fd37a45f0b66f1a3ada0613
diff --git a/designate_tempest_plugin/clients.py b/designate_tempest_plugin/clients.py
index 805eeda..8e83bcf 100644
--- a/designate_tempest_plugin/clients.py
+++ b/designate_tempest_plugin/clients.py
@@ -18,6 +18,8 @@
     ZonesClient
 from designate_tempest_plugin.services.dns.v2.json.zone_imports_client import \
     ZoneImportsClient
+from designate_tempest_plugin.services.dns.v2.json.blacklists_client import \
+    BlacklistsClient
 
 CONF = config.CONF
 
@@ -38,3 +40,4 @@
         self.zones_client = ZonesClient(self.auth_provider, **params)
         self.zone_imports_client = ZoneImportsClient(self.auth_provider,
                                                      **params)
+        self.blacklists_client = BlacklistsClient(self.auth_provider, **params)