[Bug 283414] jls (8) doesn't handle newlines in values consistently

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283414

            Bug ID: 283414
           Summary: jls (8) doesn't handle newlines in values consistently
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: dch@freebsd.org

# jail -c persist osrelease="$(echo major=1; echo minor=0)"
# jls
JID IP Address Hostname Path
145 /
# jls osrelease jid
major=1
minor=0 145

the manpage clearly states:

Each jail is represented by one row which contains space-separated values of
the listed parameter

Either we should amend the manpage, or swap newlines for spaces consistently on
all parameters.

It seems that a trailing newline is removed, so perhaps for consistency we
should replace all newlines with space when this single-line output is used.

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