- use new vpp ref build: 17.04-rc0~270-g6e9cf3b~b1891_amd64
- build tested by semiweekly job:
https://jenkins.fd.io/view/csit/job/csit-vpp-verify-master-ubuntu1604-semiweekly/3/
Change-Id: I961c512a0e5b380c3e7d1dec52ba25e45432fa2d Signed-off-by: Jan Gelety <jgelety@cisco.com>