- Work around rpmlint complaining about /var/log/journal shipped with setgid bit
This setgid bit has been already reviewed in the past and wasn't a
concern. However we want the mode/ownership adjusted by tmpfiles and
avoid the duplication of these info in rpm.
- Don't ghost own any directories created dynamically by tmpfiles
Again rpmlint complains but it doesn't seem to make sense to try to
track all paths (including theirs perms, ownerships...) created
dynamically. And 'rpm -V' is likely to report issues later with
these paths anyway.
This effectively partially reverts the two previous commits.

- Make sure the build process won't create /var/log/journal
- /var/log/journal/remote is owned by systemd-journal-remote

- systemd.spec: fix a bunch of rpmlint errors/warnings

- Drop systemd-logger
This sub package was introduced in order to configure persistent
journal and also to make sure that another syslog provider (such as
rsyslog) couldn't be installed at the same time: each syslog
provider conflicts with each others.
However this mechanism didn't work since uninstalling systemd-logger
wasn't magically turning off persistent logging because
/var/log/journal is likely to be populated hence not removed.
Moreover using a subpackage to configure the mode of journald was
overkill and the usual ways (main conf file or drop-ins) should be
preferred.

- Import commit 7a5801342fe2f53e5c2a8578d6db132c0eca2d97
8d65ec4a66 test: wc is needed by test/units/testsuite-50.sh