double commit of 1e94534f95ad109d0a1ea8d761e59c9c2e7e3417 in mainline, adding python-neutronclient for centos-icehouse to get contrail extensions support on icehouse builds

Change-Id: I5913553c831ccd0ed4f3761419cb71dcca2350a8
Merge "double commit of 1e94534f95ad109d0a1ea8d761e59c9c2e7e3417 in mainline, adding python-neutronclient for centos-icehouse to get contrail extensions support on icehouse builds"