Update underlay ssh host by VCP hodes

Change-Id: I6125db762a0974143a2454b288d3a42e9b6c5829
diff --git a/tcp_tests/requirements.txt b/tcp_tests/requirements.txt
index 26b84b9..a4149a8 100644
--- a/tcp_tests/requirements.txt
+++ b/tcp_tests/requirements.txt
@@ -17,3 +17,4 @@
 python-k8sclient==0.4.0
 salt-pepper
 setuptools<=36.2.0
+netaddr