Ensure that requested protocol is available and correct

There are a few related changes here:
* ensure that we always have the requested protocol, and
  use the default when we can't otherwise resolve it. This corrects
  the first part of CHEF-8432
* This also finishes the work started in a previous branch
  that moves the config handling out of TrainConnector::initialize
  and into a lazy loader for config.
* Ensure that the baseline configuration contains only things
  that will not be picked up when merging user-provided config. This
  meant moving :non_interactive out to the caller (bootstrap).
* Removed helpers that weren't helping much.

Signed-off-by: Marc A. Paradise <marc.paradise@gmail.com>

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