MFC r260871:

MFC r260871:

  If the flowid is available for the mbuf that finalised the creation
  of a syncache connection, copy it into the inp_flowid field.

  Without this, an incoming TCP connection won't have an inp_flowid marked
  until some data comes in, and this means that things like the per-CPU
  TCP timer option will choose a different CPU for the timer work.
  (It also means that if one grabbed the flowid via an ioctl from userland,
  it won't be available until some data has been received.)

Sponsored by:	Netflix, Inc.

git-svn-id: svn://svn.freebsd.org/base/stable/10@261705 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f