Change gazebo logs location.

Related tasks

• Capture simulation logs from stdout and stderr and upload them to S3
• Make gzserver and bridge images log stdout into a log file.

Context

Gazebo logs were saved in the /tmp/ign/logs folder, but when we tried to introduce a new set of log files that were not generated by Gazebo, we never found them in the S3 tar files. The reason was related to the fact that Gazebo removes the log folder before running.

Change

This MR solves the issue described above by saving all gazebo logs into a folder called gazebo.

Other information

• Jobs that were using logs (ReadScore, ReadStats and so) have been updated to match the new config.
• Scripts for doing some post processing after the simulation is done might need to be updated.

Additional documentation