units: conditionalize configfs and debugfs with CAP_SYS_RAWIO We really don't want these in containers as they provide a too lowlevel look on the system. Conditionalize them with CAP_SYS_RAWIO since that's required to access /proc/kcore, /dev/kmem and similar, which feel similar in style. Also, npsawn containers lack that capability.

units: add reference to new wiki page to all api mount units

man: add Documentation= tags to all kinds of missing units

relicense to LGPLv2.1 (with exceptions) We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.

units: drop automount unit for /sys/kernel/debug Since debugfs cannot be compiled as module there's little benefit in having it as autofs mount point.

units: drop /sys/kernel/config automount unit The mount point directory /sys/kernel/config is only created after the module is loaded, hence there's little value in having this an automount unit: the runtime penalty for mounting an autofs here should be the same as for a real mount.

units: Add support for automounting configfs, ala debugfs, etc.