[Bug 226931] Deprecating jail(2) and related sysctls

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226931

            Bug ID: 226931
           Summary: Deprecating jail(2) and related sysctls
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jamie at FreeBSD.org
             Flags: exp-run?, mfc-stable10-, mfc-stable11-

Created attachment 191820
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=191820&action=edit
Patch for exp-run

jail(2) has been the old way of adding jails for nearly a decade, and it's past
due for moving into COMPAT.  Also, the sysctls under security.jail that went
along with it are more confusing than useful for the modern jail_set(2) world,
and they should go away as well.

My plan is to put jail(2) under #ifdef COMPAT_FREEBSD11, and the sysctls under
#ifndef BURN_BRIDGES.  But I want to make sure I can find and hopefully fix any
ports still using jail(2).

So the included patch actually removes jail(2) and the sysctls entirely,
regardless of those defines, so an exp-run should catch anything still running
under the old system.

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