This update for systemd fixes the following issues:

- Improve logging when PID1 fails at setting a namespace up when spawning a command specified by
'Exec*='. (bsc#1172824, bsc#1142733)

pid1: improve message when setting up namespace fails.

execute: let's close glibc syslog channels too.

execute: normalize logging in *execute.c*.

execute: fix typo in error message.

execute: drop explicit *log_open()*/*log_close()* now that it is unnecessary.

execute: make use of the new logging mode in *execute.c*

log: add a mode where we open the log fds for every single log message.

log: let's make use of the fact that our functions return the negative error code for *log_oom()* too.

execute: downgrade a log message ERR → WARNING, since we proceed ignoring its result.

execute: rework logging in *setup_keyring()* to include unit info.

execute: improve and augment execution log messages.

- vconsole-setup: downgrade log message when setting font fails on dummy console. (bsc#1172195 bsc#1173539)
- fix infinite timeout. (bsc#1158336)
- bpf: mount bpffs by default on boot. (bsc#1146991)
- man: explain precedence for options which take a list.
- man: unify titling, fix description of precedence in sysusers.d(5)
- udev-event: fix timeout log messages.

This update was imported from the SUSE:SLE-15:Update update project.