Code review comment for lp:~newell-jensen/maas/rack_register_command

The justifications given in the call yesterday for using a command-line
argument over the mechanism used by install-shared-secret were:

  1. It's easier to automate.

  2. MAAS accepts passwords via the command-line elsewhere.

#1 is incorrect. #2 says that it's broken elsewhere so we'll break it
here for the sake of #1. The example of install-shared-secret means that
#2 can also be used to argue exactly the opposite, i.e.:

  2b. MAAS does not accept passwords via the command-line elsewhere.

Newell, this is nothing personal — you've implemented what was requested
— but I can't approve this and remain honest.