fixes in imports and schemas

agent/src/schema/aggregated_data_schema.py

@@ -1,10 +1,12 @@
 from marshmallow import Schema, fields
 from schema.accelerometer_schema import AccelerometerSchema
 from schema.gps_schema import GpsSchema
+from schema.parking_schema import ParkingSchema
 
 
 class AggregatedDataSchema(Schema):
     accelerometer = fields.Nested(AccelerometerSchema)
     gps = fields.Nested(GpsSchema)
+    parking = fields.Nested(ParkingSchema)
     timestamp = fields.DateTime("iso")
     user_id = fields.Int()