{watch,build,dist}bot: Make all bots use similar commandline options

{watch,build,dist}bot: Make all bots use similar commandline options

Watchbot, buildbot, and distbot do not use the same options for inputs
and outputs such as queues or directories. This commit changes the
understood commandline arguments so that the same options have the same
meaning.
Further, this commit updates the three bots to use the opt module in a
way thats compatible with toolbox > 0.3.