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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.

This separates user/group NSS lookups from host/network NSS lookups.

By default order all network mounts after host/network NSS lookups now,
and logind execution after user/group NSS lookups.

This adds minimal hardware watchdog support to PID 1. The idea is that
PID 1 supervises and watchdogs system services, while the hardware
watchdog is used to supervise PID 1.

This adds two hardware watchdog configuration options, for the runtime
watchdog and for a shutdown watchdog. The former is active during normal
operation, the latter only at reboots to ensure that if a clean reboot
times out we reboot nonetheless.

If the runtime watchdog is enabled PID 1 will automatically wake up at
half the configured interval and write to the watchdog daemon.

By default we enable the shutdown watchdog, but leave the runtime
watchdog disabled in order not to break independent hardware watchdog
daemons people might be using.

This is only the most basic hookup. If necessary we can later on hook
up the watchdog ping more closely with services deemed crucial.

Let's make things a bit easier to type, drop the systemd- prefix for
journalctl and loginctl, but provide the old names for compat.

All systemd binaries are hence now prefixed with "systemd-" with the
exception of the three primary user interface binaries:

systemctl
loginctl
journalctl

For those three we do provide systemd-xyz names as well, via symlinks:

systemd-systemctl → systemctl
systemd-loginctl → loginctl
systemd-journalctl → journalctl

We do this only for the *primary* user tools, in order to avoid
unnecessary namespace problems. That means tools like systemd-notify
stay the way they are.

Noticed by Sergey Ptashnick

They've moved to systemd-ui.

After long consideration we came to the conclusion that user
configuration in /etc should always override the (generally computer
generated) configuration in /run. User configuration should always be
what matters over anything else. Hence rearrange the search orders
accordingly.

In general this should change very little as overriding like this is
seldomn done so far, and the order between /etc and /usr stays the same.

https://bugzilla.redhat.com/show_bug.cgi?id=798760

(Note that this work is not complete yet, as the kernel seems to send us
useless data with SCM_SECURITY enabled)

As requested by Raphaël Hertzog from the Debian project, include
information about the home page and support/bug report pages in
/etc/os-release.

As requested by Raphaël Hertzog from the Debian project, encode
derivative information in /etc/os-release.

change conflicting man/machine-info.xml documentation to match functionality in
src/hostname/hostnamed.c 114-119