[Bug 192951] New: Allow fdescfs to be used in hierarchical jails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192951

            Bug ID: 192951
           Summary: Allow fdescfs to be used in hierarchical jails
           Product: Base System
           Version: 10.0-STABLE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ruben at verweg.com

Created attachment 146188
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=146188&action=edit
patch that introduces allow.mount.fdescfs

FreeBSD has hierarchical jail support since r192895. However, not being able to
mount all required filesystems makes it somewhat less useful as some software
(bash, java) requires fdescfs being mounted on /dev/fd

This patch introduces the jail parameter allow.mount.fdescfs. Tested on r268794

Possible caveat is that PR_ALLOW_ALL went from 0x0fff to 0xffff and only space
for three more options to pr_allow. The flags field still remains a word and
should imho not introduce a ABI change.

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