1.modifying the parser as in sanity we use ubuntu_traffic image for netperf test since the output on the vm with this image was different than on the VM launched with ubuntu-netperf image. 2. Correcting the typo in sanity_resource.py while launching vn1_vm6

Change-Id: I4efcff25bf581d1c3205ebe6c4c94039e82c139b