Fix underlay SSH for VCP nodes on baremetal labs

Change-Id: I8c82b8ad1bdb0a45452a50dd59f4cb2ecfa57691
diff --git a/tcp_tests/fixtures/salt_fixtures.py b/tcp_tests/fixtures/salt_fixtures.py
index 9bd24b3..469b965 100644
--- a/tcp_tests/fixtures/salt_fixtures.py
+++ b/tcp_tests/fixtures/salt_fixtures.py
@@ -76,6 +76,8 @@
             [node for node in salt_nodes
              if not any(node['node_name'] == n['node_name']
                         for n in config.underlay.ssh)]
+        underlay.config_ssh = []
+        underlay.add_config_ssh(config.underlay.ssh)
 
         hardware.create_snapshot(ext.SNAPSHOT.salt_deployed)
         salt_actions.sync_time()