[Bug 214284] [feature suggestion] Allow services to run additional instances

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214284

            Bug ID: 214284
           Summary: [feature suggestion] Allow services to run additional
                    instances
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: yuri at rawbw.com

In https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207129 I implemented the
instances functionality for security/tor, when additional instances of Tor can
be run under the umbrella of the same service.

I am going to generalize that functionality so that some other servers can use
the additional instances too.

This will be implemented in /etc/rc.subr.

> # /etc/rc.conf will include the lines like this:
> <name>_enable="YES"
> <name>_instances="inst1:<param1>:<param2>{:...} {inst2:<param1>:<param2>{:...} {...additional instances...}}"
> <name>_disable_default_instance="YES"

Then service commands
> # service <cmd> <name> {<instance>}
will execute the command <cmd> on all defined instances, or on one instance
<instance>.

rc scripts will have to include the process_instances call with instance
declaration:

> process_instances "$1" "$2" "<param1>/<param1_type>:<param2>/<param2_type>{:...}" || return $?
> ...
> run_rc_command_with_instances "$1"

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