Make logging of MQTT realtime updater more uniform

[abyrd]

Summary

This makes the messages output by the MQTT GTFS Realtime updater more similar to those produced by other updaters. It just makes the logs more uniform and slightly more informative.

It has been tested in local usage with a connection to the Digitransit MQTT RT feeds.

The code formatting rules make the toString method harder to read, so maybe this should be converted to a StringBuilder or equivalent.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 67.78%. Comparing base (5edc5ae) to head (c80651c).
Report is 2 commits behind head on dev-2.x.

Files	Patch %	Lines
...pplanner/updater/trip/MqttGtfsRealtimeUpdater.java	0.00%	7 Missing ⚠️
...anner/updater/alert/GtfsRealtimeAlertsUpdater.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #5642      +/-   ##
=============================================
- Coverage      67.79%   67.78%   -0.01%     
+ Complexity     16524    16521       -3     
=============================================
  Files           1904     1904              
  Lines          72267    72273       +6     
  Branches        7439     7439              
=============================================
- Hits           48991    48989       -2     
- Misses         20759    20767       +8     
  Partials        2517     2517              

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[abyrd]

Tested on Finland data and updater:

21:30:37.655 INFO [main]  (GtfsRealtimeAlertsUpdater.java:54) Creating real-time alert updater running every PT30S: https://realtime.hsl.fi/realtime/service-alerts/v2/hsl
21:30:37.657 INFO [main]  (PollingVehiclePositionUpdater.java:64) Creating vehicle position updater running every PT30S: GtfsRealtimeHttpVehiclePositionSource{url: https://realtime.hsl.fi/realtime/vehicle-positions/v2/hsl}
21:30:37.675 INFO [main]  (MqttGtfsRealtimeUpdater.java:83) Creating streaming GTFS-RT TripUpdate updater subscribing to MQTT broker at tcp://pred.rt.hsl.fi
21:30:37.677 INFO [main]  (GraphUpdaterManager.java:111) Scheduling polling updater GtfsRealtimeAlertsUpdater{url: 'https://realtime.hsl.fi/realtime/service-alerts/v2/hsl'}
21:30:37.678 INFO [main]  (GraphUpdaterManager.java:111) Scheduling polling updater PollingVehiclePositionUpdater{source: GtfsRealtimeHttpVehiclePositionSource{url: https://realtime.hsl.fi/realtime/vehicle-positions/v2/hsl}}
21:30:37.678 INFO [main]  (GraphUpdaterManager.java:123) Starting new thread for updater MqttGtfsRealtimeUpdater{url: 'tcp://pred.rt.hsl.fi', topic: 'gtfsrt/v2/fi/hsl/tu', feedId: '1'}