add missing RFC3542 definition.
add missing RFC3542 definition.

Submitted by:	Keiichi SHIMA <keiichi__at__iijlab.net>
Obtained from:	KAME

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase