One successful travis build. Ref: #1186

.travis.yml

@@ -4,7 +4,7 @@ env:
 - DISTRO=ubuntu-trusty
 
 before_script:
-    - sudo ls -l /sys/class/net
+    - sudo ls -l /sys
     - sudo ls -l --dereference /sys/class/net 
     - sudo ls -lad /sys/class
     - sudo ls -lad /sys/devices