Comment out broken part in create_port

We will need to clean this up when we work on
Quantum SG.
Remove dev mode in init

Remove the dev mode from init method and always throw exception
if provider or metdata router IDs are not set.

Signed-off-by: Alex Vasilyev <avasilyev@midokura.com>
Signed-off-by: Ryu Ishimoto <ryu@midokura.com>