flake8 beautifications

ogn/commands/showdevices.py

@@ -1,6 +1,6 @@
 from ogn.commands.dbutils import session
 from ogn.model import Device, AircraftType
-from sqlalchemy import func, and_, true, false
+from sqlalchemy import func
 
 from manager import Manager
 manager = Manager()

ogn/gateway/process.py

@@ -2,7 +2,6 @@ import logging
 from ogn.commands.dbutils import session
 from ogn.model import AircraftBeacon, ReceiverBeacon, Device, Receiver, Location
 from ogn.parser import parse_aprs, parse_ogn_receiver_beacon, parse_ogn_aircraft_beacon, ParseError
-from ogn.model.address_origin import AddressOrigin
 
 logger = logging.getLogger(__name__)