Merge pull request #3170 from poettering/v230-preparation-fixes

make virtualization detection quieter, rework unit start limit logic, detect unit file drop-in changes correctly, fix autofs state propagation

diff --cc src/core/automount.c
Simple merge

diff --cc src/core/busname.c
Simple merge

diff --cc src/core/mount.c
Simple merge

diff --cc src/core/swap.c
Simple merge

diff --cc src/core/unit.c
Simple merge

diff --cc src/core/unit.h
Simple merge