create fdholderd and oneshotd service directory at scandir creation. Remove creation of livetree directory

change interface: owner argument is now an option and argument are create|remove. The up option is splitted to 66-scanctl. add -B to boot inside a container. Add -c to not define a logger. Revamp write_control() function. Create new directory (default /run/66/scandir/container/) in case of container boot

crash on system failure not on empty environment, also this is valuable for the 66-boot (wrong previous commit) change