Fixes #5113: Correct rudder-agent-thin Makefile to have a correct localclean target
Merge pull request #399 from Kegeruneku/bug_5113/int/5113_correct_rudder_agent_thin_localclean

Fixes #5113: Correct rudder-agent-thin Makefile to have a correct localc...
Fixes #5115: Make rudder-agent-thin able to operate even when rudder-agent.list does not exist