[Foxy] Allow configuring logging directory through environment variables #70
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Backport of functionality from PR Allow configuring logging directory through environment variables #53.
This allows configuring the logging directory through environment variables using the following logic:
Use $ROS_LOG_DIR if ROS_LOG_DIR is set and not empty.
Otherwise, use $ROS_HOME/log, using ~/.ros for ROS_HOME if not set or if empty.
Implemented only for spd log.
Should it also be added for log4cxx? If so, should a copy of the rcl_logging_get_logging_directory API be added to the log4cxx package?