Better name for the physical HW layer

Change-Id: I7a76f915484d71779b3024252420445ed8297be9
diff --git a/site.yml b/site.yml
index 8650f94..fc6ca1e 100644
--- a/site.yml
+++ b/site.yml
@@ -14,6 +14,6 @@
     - role: ci_logs_server
 
 - name: virt hypervisors
-  hosts: virt-nodes
+  hosts: virt-hw
   roles:
     - role: virt_node_for_ci