shared net support. Diff from Ajay. Todo: Handle resetting the shared flag. Floating ip allocation from horizon
(cherry picked from commit cecb9c9828399fb6101379ee9e09a4d2172f769e)
don't always use api_server_host='127.0.0.1'
added setup.py to install src/config/utils scripts in contrail_utils Python package
fixing setup.py for contrail_utils
disabled api-server/doc to avoid scons dependency cycle error
remove extra setup.py from contrail_utils install dir
contrail_veth_port.  added main() entry point, cleaned up trailing whitespace
added script entry points for contrail_utils scripts