[Bug 247618] /etc/rc.d/savecore doesn't work if dumpdev is a GEOM name

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247618

            Bug ID: 247618
           Summary: /etc/rc.d/savecore doesn't work if dumpdev is a GEOM
                    name
           Product: Base System
           Version: 12.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

If in /etc/rc.conf you specify dumpdev as "auto" or an absolute path like
"/dev/label/dump0", then everything is fine.  But if you specify it as a geom
name like "label/dump0", then /etc/rc.d/savecore won't be able to find it.  The
problem is not immediately apparent because /etc/rc.d/dumpon _does_ accept
dumpdev in that format (added by smh in r291207).

I see two possible good solutions:
1) Modify /etc/rc.d/savecore to check "savecore -C /dev/${dev}" if "savecore -C
${dev}" fails.
2) Modify /etc/rc.d/savecore to check for /dev/dumpdev even if dumpdev is not
set to "auto"

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