'Initialize base class for specific L2 agent type.
:param agent_type: Constant identifying agent type in agents_db
:param supported_vnic_types: The binding:vnic_type values we can bind'

def __init__(self, agent_type, supported_vnic_types=[portbindings.VNIC_NORMAL]):

    self.agent_type = agent_type
    self.supported_vnic_types = supported_vnic_types
