refactor-864370: s/mockCommands/exports/g
refactor-864370: s/mockCommands/exports/g

We're trying to remove aliases of exports, this is one more down.
Also add 'use strict' and move the setup/shutdown to the bottom where
everything has been clearly defined.

Signed-off-by: Joe Walker <7a17872fbb32c7d760c9a16ee3076daead11efcf@mozilla.com>

mozilla/gcli,mozilla/gcli,joewalker/gcli,mozilla/gcli,joewalker/gcli