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Environment reset is broken

See original GitHub issue

Bug Description

The environment does not reset properly when flow.core.experiment.Experiment.run is called with num_runs > 1.

Bug Reproduce

File in which the bug occurred: examples/sumo/bottlenecks.py

The exact command that you did run that caused the bug: python examples/sumo/bottlenecks.py

Output Log

(traffic-lights) ➜  flow git:(simulation) ✗ python examples/sumo/bottlenecks.py
/Users/brandon/projects/forks/flow/flow/utils/flow_warnings.py:20: UserWarning: The attribute vehsPerHour in InFlows is deprecated, use vehs_per_hour instead.
  dep_from, obj.__class__.__name__, dep_to))
/Users/brandon/projects/forks/flow/flow/utils/flow_warnings.py:20: UserWarning: The attribute departLane in InFlows is deprecated, use depart_lane instead.
  dep_from, obj.__class__.__name__, dep_to))
/Users/brandon/projects/forks/flow/flow/utils/flow_warnings.py:20: UserWarning: The attribute departSpeed in InFlows is deprecated, use depart_speed instead.
  dep_from, obj.__class__.__name__, dep_to))
Loading configuration... done.
Success.
 Retrying in 1 seconds
Could not connect to TraCI server at localhost:53921 [Errno 61] Connection refused
 Retrying in 2 seconds
Could not connect to TraCI server at localhost:53921 [Errno 61] Connection refused
 Retrying in 3 seconds
Could not connect to TraCI server at localhost:53921 [Errno 61] Connection refused
 Retrying in 4 seconds
Loading configuration... done.
**********************************************************
**********************************************************
**********************************************************
WARNING: Inflows will cause computational performance to
significantly decrease after large number of rollouts. In
order to avoid this, set SumoParams(restart_instance=True).
**********************************************************
**********************************************************
**********************************************************
Round 0, return: 847.0800000000135
**********************************************************
**********************************************************
**********************************************************
WARNING: Inflows will cause computational performance to
significantly decrease after large number of rollouts. In
order to avoid this, set SumoParams(restart_instance=True).
**********************************************************
**********************************************************
**********************************************************
Traceback (most recent call last):
  File "examples/sumo/bottlenecks.py", line 202, in <module>
    exp.run(5, 1000)
  File "examples/sumo/bottlenecks.py", line 57, in run
    state = self.env.reset()
  File "/Users/brandon/projects/forks/flow/flow/envs/base_env.py", line 496, in reset
    self.k.update(reset=True)
  File "/Users/brandon/projects/forks/flow/flow/core/kernel/kernel.py", line 100, in update
    self.vehicle.update(reset)
  File "/Users/brandon/projects/forks/flow/flow/core/kernel/vehicle/traci.py", line 138, in update
    if vehicle_obs[veh_id] is None:
KeyError: 'flow_00.231'