Use tenant id instead of name for provider tenant
Use tenant id instead of name for provider tenant

Signed-off-by: Tomoe Sugihara <6015414ca332492cf0bb4dbbac212276d1c110a7@midokura.com>
Signed-off-by: Ryu Ishimoto <079ed83f2117612507014e8df63a80b706c7096b@midokura.com>

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