Add variable floating_network_name

Change-Id: Ia9bfd2a5590d1a0e19ea809dcef829dc446cf5a4
diff --git a/metadata/service/tempest/init.yml b/metadata/service/tempest/init.yml
index b9dbe3c..cae4bce 100644
--- a/metadata/service/tempest/init.yml
+++ b/metadata/service/tempest/init.yml
@@ -41,6 +41,7 @@
           image_ref_alt: ${_param:glance_image_cirros_name}
         network:
           public_network_id: ${_param:runtest_tempest_public_net}
+          floating_network_name: ${_param:runtest_tempest_public_net}
       cfg_dir: ${_param:runtest_tempest_cfg_dir}
       cfg_name: ${_param:runtest_tempest_cfg_name}
       DEFAULT: