Refactor some of the MI kernel dump code in preparation for netdump.

- Add clear_dumper() to complement set_dumper().
- Drain netdump's preallocated mbuf pool when clearing the dumper.
- Don't do bo

Refactor some of the MI kernel dump code in preparation for netdump.

- Add clear_dumper() to complement set_dumper().
- Drain netdump's preallocated mbuf pool when clearing the dumper.
- Don't do bounds checking for dumpers with mediasize 0.
- Add dumper callbacks for initialization for writing out headers.

Reviewed by: sbruno
MFC after: 1 month
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D15252

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Move most of the contents of opt_compat.h to opt_global.h.

opt_compat.h is mentioned in nearly 180 files. In-progress network
driver compabibility improvements may add over 100 more so this is
close

Move most of the contents of opt_compat.h to opt_global.h.

opt_compat.h is mentioned in nearly 180 files. In-progress network
driver compabibility improvements may add over 100 more so this is
closer to "just about everywhere" than "only some files" per the
guidance in sys/conf/options.

Keep COMPAT_LINUX32 in opt_compat.h as it is confined to a subset of
sys/compat/linux/*.c. A fake _COMPAT_LINUX option ensure opt_compat.h
is created on all architectures.

Move COMPAT_LINUXKPI to opt_dontuse.h as it is only used to control the
set of compiled files.

Reviewed by: kib, cem, jhb, jtl
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D14941

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