Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Allow admins to specify a regex which is applied (in the negative) to the
output from df, similar to what security/200.chkmounts does. This can be
useful to avoid listing automounted ZFS snapshots, for instance.

MFC after: 1 week

Only output a list of file systems that need to be dumped if the system
has a non-empty dumpdates file.

Reviewed by: brooks
MFC after: 1 week

Silence warning printed by getfsspec(3) when /etc/fstab does not exist
fstab: /etc/fstab:0: No such file or directory
and from dump(8) when setfsent(3) fails due to /etc/fstab not existing:
DUMP: Can't open /etc/fstab for dump table information: No such...

This makes daily and security periodic runs somewhat cleaner in jails
which lack /etc/fstab files.

MFC after: 1 month

Set rc=1 rather than 0 so that setting daily_show_success=YES masks
the output of all goes well.

PR: 34825
Submitted by: Valentin Nechayev <netch@netch.kiev.ua>
MFC after: 3 weeks

Another overhaul of the periodic stuff.

All periodic sub-scripts <larf> now have their return codes interpreted
by periodic(8). Output may be masked based on variable values in
periodic.conf.

It's also now possible to email periodic output to arbitrary addresses,
or to send it to a log file, examples of which can be found in
newsyslog.conf.

The upshot of it all should be no discernable changes to the default
behaviour of periodic(8).

PR: 21250

Introduce a new option, daily_status_disks_df_flags, which specifies
the command-line arguments to be used for the call to df(1) when
daily_status_disks_enable is set to YES.

The name of the new variable was chosen by the maintainer of our
periodic hierarchy, Brian Somers.

PR: 19631

Introduce /etc/defaults/periodic.conf, similar in concept to rc.conf.
The only change in the default functionality should be that
the output reports are slightly more verbose WRT files deleted.

Not objected to by: freebsd-arch

$Id$ -> $FreeBSD$

This commit was generated by cvs2svn to compensate for changes in r28263,
which included commits to RCS files with non-trunk default branches.

Copy /etc/cron.d to /etc/periodic per-request of many.
This wasn't done with a repository copy because there was no
history of any consequence. Flames to me.