ifconfig if0 netmask xxx.xxx.xxx.0 didn't change the netmask.
ifconfig if0 netmask xxx.xxx.xxx.0 didn't change the netmask.

PR:		bin/28833
MFC after:	3 days

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