MFC r273359:
  It seems multicast filtering of RTL8168F does not work.  Workaround
  the silicon bug by accepting any multicast packets.

  PR:	193488
MFC r273370:
Correct the calculation of tcps_rto in the struct tcpcb -> tcpsinfo_t
translator.
Merge remote-tracking branch 'freebsd/stable/10' into freebsd10
MFC r273638:
Revert somewhat hackish geom_disk optimization, committed as part of r256880,
and the following r273143 commit, supposed to workaround introduced issue by
quite innocent-looking change.

While there is no clear understanding why, but r273143 is accused in data
corruption in some environments with high I/O load.  I personally don't see
any problem in that commit, and possibly it is just a trigger to some other
bug somewhere, but better safe then sorry for now.

Requested by:	scottl@
MFC r273457: Document sort_io_queue sysctls/tunables.
MFC r273666.
Don't pass the 'error' return from an I/O port handler directly to vm_run().
Merge branch 'freebsd10' of gitserver.ixsystems.com:/git/repos/freenas-build/trueos into freebsd10
Merge remote-tracking branch 'freebsd/stable/10' into freebsd10