fix for 1349687 by adding pyhton-neutronclient local build and removing stock python-neutronclient. This will enable contrail extensions (ipam/policy/vpcroutetables). Added new directory for icehouse, similar directory structure will be done for havana and icehouse for other openstack packages

Change-Id: Id6fbf264922b23b7df5b506637a7b0b2d5d4535f