refactor: don't require host= for check_connectivity

When ssh_client is passed, the argument is not used.

Change-Id: Ibf73130fbf82c2ed85e16b3f69aacbc2930efb3d
diff --git a/neutron_tempest_plugin/scenario/test_metadata.py b/neutron_tempest_plugin/scenario/test_metadata.py
index 239f6bc..e80e73b 100644
--- a/neutron_tempest_plugin/scenario/test_metadata.py
+++ b/neutron_tempest_plugin/scenario/test_metadata.py
@@ -169,8 +169,7 @@
             self.network, use_advanced_image=use_advanced_image)
         self.wait_for_server_active(server=vm.server)
         self.wait_for_guest_os_ready(vm.server)
-        self.check_connectivity(host=vm.floating_ip['floating_ip_address'],
-                                ssh_client=vm.ssh_client)
+        self.check_connectivity(ssh_client=vm.ssh_client)
         interface = self._get_primary_interface(vm.ssh_client)
 
         try: