add bagfile migration rule for old atf_msgs prior to 2020-05

[floweisshardt]

No description provided.

[floweisshardt]

pylint errors:

  ************* Module rule202005.bmr
  src/atf/atf_msgs/migration_rules/rule202005.bmr.py:1: [E0602(undefined-variable), update_atf_msgs_MetricResult_438a6e6fcdba4c073c5c940bc183fe12] Undefined variable 'MessageUpdateRule'
  src/atf/atf_msgs/migration_rules/rule202005.bmr.py:111: [E0602(undefined-variable), update_atf_msgs_Groundtruth_adbb6bb4eb068fd5af7659b413397d10] Undefined variable 'MessageUpdateRule'
  src/atf/atf_msgs/migration_rules/rule202005.bmr.py:150: [E0602(undefined-variable), update_atf_msgs_TestblockStatus_361a3a189cc39d4afd9ca41fbafd986b] Undefined variable 'MessageUpdateRule'

👉 need to me ignored because they are autogenerated via rosbag check