[Bug 194279] teach dumpsys / savecore to use dumpdev's sectorsize

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194279

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A commit references this bug:

Author: cem
Date: Fri Apr 15 17:45:12 UTC 2016
New revision: 298076
URL: https://svnweb.freebsd.org/changeset/base/298076

Log:
  Add 4Kn kernel dump support

  (And 4Kn minidump support, but only for amd64.)

  Make sure all I/O to the dump device is of the native sector size.  To
  that end, we keep a native sector sized buffer associated with dump
  devices (di->blockbuf) and use it to pad smaller objects as needed (e.g.
  kerneldumpheader).

  Add dump_write_pad() as a convenience API to dump smaller objects with
  zero padding.  (Rather than pull in NPM leftpad, we wrote our own.)

  Savecore(1) has been updated to deal with these dumps.  The format for
  512-byte sector dumps should remain backwards compatible.

  Minidumps for other architectures are left as an exercise for the
  reader.

  PR:           194279
  Submitted by: ambrisko@
  Reviewed by:  cem (earlier version), rpokala
  Tested by:    rpokala (4Kn/512 except 512 fulldump), cem (512 fulldump)
  Relnotes:     yes
  Sponsored by: EMC / Isilon Storage Division
  Differential Revision:        https://reviews.freebsd.org/D5848

Changes:
  head/sbin/savecore/savecore.c
  head/sys/amd64/amd64/minidump_machdep.c
  head/sys/kern/kern_dump.c
  head/sys/kern/kern_shutdown.c
  head/sys/sys/conf.h

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