need ethtool for proper iface generation

Change-Id: I5070867d6c005a7a8e7c89d2153ab0986662d64e
diff --git a/roles/compute-node/tasks/main.yml b/roles/compute-node/tasks/main.yml
index 53c3c60..d5dd19a 100644
--- a/roles/compute-node/tasks/main.yml
+++ b/roles/compute-node/tasks/main.yml
@@ -16,6 +16,7 @@
     - python-pip
     - ifenslave-2.6
     - bridge-utils
+    - ethtool
 
 - name: Ensure Docker Insecure Repository
   become: yes