Kristof Provost 19dc644511 if_stf: add 6rd support
Implement IPv6 Rapid Deployment (RFC5969) on top of the existing 6to4
(RFC3056) if_stf code.

PR:		253328
Reviewed by:	hrs
Obtained from:	pfSense
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D33037
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