Passes the network name to Data Client.

Before the MidonetNetworkHandler did not pass the network (bridge)
name, which is a required field, to DataClient, thus creating a bridge
with name being null. With the change MidonetNetworkHandler correctly
passes a network name to DataClient.
Merge pull request #8 from midokura/dev/tomohiko/create_bridge/20140107

Passes the network name to Data Client.