Add missing kernal tunables to loader.conf.
Add missing kernal tunables to loader.conf.

PR:		i386/39085
Submitted by:	David Yeske <dyeske@yahoo.com>

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