MFC r256689 (modified):
  Use the same actor key for media types of the same speed.

  PR:		176097

MFC r256832:
  Add a note that lacp_compose_key() should be updated, when new media
  types will be added.

  Submitted by:	melifaro
MFC r257084:
  Initialize inc_fibnum for properly handling ICMP6_PACKET_TOO_BIG
  errors in multifib environment.

  PR:		183265
MFC 254699,255030:
Use tvtohz() to convert a socket buffer timeout to a tick value rather
than using a home-rolled version.  The home-rolled version could result
in shorter-than-requested sleeps.

PR:		kern/181416
MFC 255248:
Use an unsigned long when indexing into mfchashtbl[] and mf6ctable[].  This
matches the types used when computing hash indices and the type of the
maximum size of mfchashtbl[].

PR:		kern/181821
MFC 255497:
Fix an off-by-one error when populating mincore(2) entries for
skipped entries.  lastvecindex references the last valid byte,
so the new bytes should come after it.
MFC 256293:
Sanitize the %eflags returned by BIOS routines.  Some BIOS routines enter
protected mode and may leave protected-mode-specific flags like PSL_NT set
when they return to real mode.  This can cause a fault when BTX re-enters
protected mode after the BIOS mode returns.

PR:		amd64/182740
MFC 256274:
Ignore attempts to set the nmbcluster sysctls to their current value
rather than failing with an error.