Update of VPP_STABLE_VER files and DPDK_STABLE_VER file

- use new vpp ref build - ubuntu 16.04:
  17.07-rc0~144-g36c1308~b2247_amd64

- use new vpp ref build - centos7:
  17.07-rc0~268-gc7409dc~b2371_amd64

- use new DPDK version:
  17.05-vpp3

- builds tested by semiweekly jobs:
  https://jenkins.fd.io/view/csit/job/csit-vpp-verify-master-ubuntu1604-semiweekly/39/
  https://jenkins.fd.io/view/csit/job/csit-vpp-verify-master-centos7-semiweekly/39/

Change-Id: I7ed3e1011ae6b1e9fa9a6a3fd98fc5ebcb8bfdf9
Signed-off-by: Jan Gelety <jgelety@cisco.com>