make witness it's own sysctl branch instead of using _ to do this.  I have left the old tunables in to give people a few days to transition their loader.conf and sysctl.conf's over to the new names..
make witness it's own sysctl branch instead of using _ to do this.  I have
left the old tunables in to give people a few days to transition their
loader.conf and sysctl.conf's over to the new names..

MFC after:	5 days

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