Move lbaas URL provider methods
Move lbaas URL provider methods

Place the methods to generate LBaaS URLs to the correct class.

Signed-off-by: Ryu Ishimoto <079ed83f2117612507014e8df63a80b706c7096b@midokura.com>

midokura/python-midonetclient,midonet/python-midonetclient,midonet/python-midonetclient,midokura/python-midonetclient