cleanup of tools/packaging/third_party/Makefile, This is only used for centos build:
	removal of grizzly specific targets
	removal of spec files no longer needed
	change default sku to havana
	removed ifdef not needed after removing grizzly
Next pass would be to move openstack client pacakges from tools/packaging/third_party to tools/packaging/openstack/centos_64/

Change-Id: Ie5f078ba7c3b8c18c9576d8610e34d059610b109