container mac addresses should use 'locally assigned' section

[John A Meinel]

We currently always prefix container MAC addresses with:
const macAddressTemplate = "00:16:3e:%02x:%02x:%02x"

These appear to be allocated to "Xensource, Inc.".

https://en.wikipedia.org/wiki/MAC_address#Universal_vs._local

Indicates that we should be setting the second least-significant bit (eg 0x02) to indicate that we are creating these addresses as a "network admin", and not as a Manufacturer that is guaranteeing they are globally unique.