Add "-rabbit_boot_step" module attribute to specify startup sequence.

 - The plugin activator prepares the startup plan.

 - This means that it's no longer going to work to run without a boot
   script. Consequently, I've added a call to
   rabbitmq-activate-plugins to the Makefile for the 'all' target.

 - I've refactored the old boot sequence to use the new method for
   specifying boot steps. I've conservatively put dependencies forcing
   them into a straight line, as they were before.

 - Since the plugin activator runs so frequently, I've made it
   suppress the (spurious) warnings we get about core beam files being
   out of date on Ubuntu.

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