Add sanity check to make sure that the MAC address isn't all 0's.  Bad boot loaders can do this, and this leads to all kinds of ill effects downstream.  Also, minor formatting nits.
Add sanity check to make sure that the MAC address isn't all 0's.  Bad
boot loaders can do this, and this leads to all kinds of ill effects
downstream.  Also, minor formatting nits.

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