log: honour the kernel's quiet cmdline argument

It was forgotten in b1e90ec515408aec2702522f6f68c4920b56375b

See https://bugs.freedesktop.org/show_bug.cgi?id=79582
machine-id-setup: fix array size of parameters

Not that it really would have any effect on the generated code, but
let's not confuse people...
bus-proxy: fix misplaced s/system/session/
label: when clearing selinux context, don't mangle errno
tmpfiles: various modernizations
tmpfiles: add new "C" line for copying files or directories
tmpfiles: get rid of "m" lines, make them redundant by "z"

"m" so far has been a non-globbing version of "z". Since this makes it
quite redundant, let's get rid of it. Remove "m" from the man pages,
beef up "z" docs instead, and make "m" nothing more than a compatibility
alias for "z".
update TODO
tmpfiles: always recreate the most basic directory structure in /var

Let's allow booting up with /var empty. Only create the most basic
directories to get to a working directory structure and symlink set in
/var.
nspawn: add new --tmpfs= option to mount a tmpfs on specific directories, such as /var
tmpfiles: static variables populated immediately from the command line should be prefixed with arg_
tmpfiles: when processing lines, always process prefixes before suffixes

If two lines refer to paths that are suffix and prefix of each other,
then always process the prefix first, the suffix second. In all other
cases strictly process rules in the order they appear in the files.

This makes creating /var/run as symlink to /run a lot more fun, since it
is automatically created first.
tmpfiles: remove unnecessary function
tmpfiles: if /var is mounted from tmpfs, we should adjust its access mode
tmpfiles: add ability to mask access mode by pre-existing access mode on files/directories

This way it makes a lot more sense to specify an access mode for "Z"
lines.
tmpfiles: don't apply sgid and executable bit to journal files, only the directories they are contained in
update TODO
tmpfiles: don't allow read access to journal files to users not in systemd-journal

Also, don't apply access mode recursively to /var/log/journal/*/, since
that might be quite large, and should be correct anyway.
journald: create /run/log/journal with the correct access modes
udev: stop using "floppy" group