def __init__(self, host = '', port = LMTP_PORT, local_hostname = None):
        SMTP.__init__(self, host, port, local_hostname)
List all metering labels.
dataset/ETHPy150Open deanhiller/databus/webapp/play1.3.x/python/Lib/smtplib.py/LMTP.__init__--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/extensions/metering.py/MeteringPluginBase.get_metering_labels