turtlebot/3ea2c30: liveness seems far fetched

[gavanderhoorn]

turtlebot/3ea2c30 is labelled SOFTWARE:LIVENESS. This seems hard to justify given the description:

robust/turtlebot/3ea2c30/3ea2c30.bug

Lines 4 to 14 in 93afbcb

	title: Environment Hooks Introduce Undocumented Dependency
	description: >
	ROS packages can make use of environment hooks -- shell scripts
	that are executed, for instance, to set up environment variables.
	In ROS Indigo, the core Turtlebot package introduced an
	environment hook that depended on another package that was not
	listed as a dependency in the package manifest. This caused error
	messages to be printed to the terminal if the user did not have
	the package installed.
	The fix was to move the faulty parts of the environment hook to
	the package they depended on.

The user reporting the bug essentially describes he gets a warning, but does not mention any loss of functionality, nor any components which fail to function properly.

He's not using the components which depend on the bit of script which is not working (ie: the environment hook): the navigation stack would depend on the TURTLEBOT_MAP_FILE env var being set, but he doesn't use it.

LOSS-OF-CONTROL is even harder to justify: if this were a completely automated system, the map not being configured for the navigation stack could certainly lead to the robot not being able to navigate, but it would not even start up (ie: it would never have control, so it can't lose it).

[gavanderhoorn]

Apparently I'd already posted this.

Closing as a duplicate of #415.