r281955 removed M_FLOWID which could cause problems for old drivers still using

r281955 removed M_FLOWID which could cause problems for old drivers still using
the field. It cannot be removed from stable/10 so restore it.

Change M_HASHTYPE_GET() and M_HASHTYPE_SET() to do the right thing when M_FLOWID
exists.

Also bumping the FreeBSD version to note the fact that M_FLOWID is brought back
in stable/10.
(Just a note that M_FLOWID has been removed from -head.)

Spotted by:	np
Suggested by:	hans
Reviewed by:	hans, tuexen (earlier version)
Helped by:	jhb, delphij, gjb
Sponsored by:	Limelight Networks

git-svn-id: svn://svn.freebsd.org/base/stable/10@282781 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f