rc.d: add a service jails config to all base system services

This gives more permissions to services (e.g. network access to
services which require this) when they are started as an automatic
servic

rc.d: add a service jails config to all base system services

This gives more permissions to services (e.g. network access to
services which require this) when they are started as an automatic
service jail.

The sshd patch is important for the sshd-related functionality as
described in the man-page in the service jails part.

The location of the added env vars is supposed to allow overriding them
in rc.conf, and to hard-disable the use of svcj for some parts where it
doesn't make sense or will not work.

Only a subset of all of the services are fully tested (I'm running this
since more than a year with various services started as service jails).
The untested parts should be most of the time ok, in some edge-cases
more permissions are needed inside the service jail.
Differential Revision: https://reviews.freebsd.org/D40371

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Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Merge ^/head r364082 through r364250.

MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

When booting a system with WITHOUT_IPFILTER the following errors
are encountered at boot time:

rcorder: requirement `ipfs' in file `/etc/rc.d/netif' has no providers.
rcorder: requirement `ipfilter'

When booting a system with WITHOUT_IPFILTER the following errors
are encountered at boot time:

rcorder: requirement `ipfs' in file `/etc/rc.d/netif' has no providers.
rcorder: requirement `ipfilter' in file `/etc/rc.d/netif' has no
providers.
rcorder: requirement `ipfilter' in file `/etc/rc.d/netwait' has no
providers.
rcorder: requirement `ipfilter' in file `/etc/rc.d/net_watchdog' has no
providers.
rcorder: requirement `ipfilter' in file `/etc/rc.d/securelevel' has no
providers.

Listing its own requrements in BEFORE rather than use REQUIRE of
non-optional scripts resolves this issue.

The issue was discovered and patched by glebius at Netflix.

Submitted by: glebius
Reported by: glebius
MFC after: 1 week

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MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

Load ipfilter, ipnat, and ippool rules, and start ipmon in a vnet jail.

PR: 248109
Reported by: joeb1@a1poweruser.com
MFC after: 2 weeks

Merge ^/head r340427 through r340868.

Allow forced start of ipmon in special cases where testing is desired
(or other special cases) and when ipfilter is disabled in rc.conf but
started by other means.

MFC after: 1 week

Merge ^/head r339015 through r339669.

Move the rc framework out of sbin/init into libexec/rc.

The reasons for this are forward looking to pkgbase:
* /sbin/init is a special binary; try not to replace it with
every package update bec

Move the rc framework out of sbin/init into libexec/rc.

The reasons for this are forward looking to pkgbase:
* /sbin/init is a special binary; try not to replace it with
every package update because an rc script was touched.
(a follow-up commit will make init its own package)
* having rc in its own place will allow more easy replacement
of the rc framework with alternatives, such as openrc.

Discussed with: brd (during BSDCam), kmoore
Requested by: cem, bz
PR: 231522
Approved by: re (gjb)

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