Refactor to better handling the difference between a testing database and a

production database.

- Add an IDatabaseFactory interface with two named utility implementations.
  The initialization subsystem will either ask for the 'testing' or
  'production' factory utility depending on whether we're in the test suite or
  not.  The testing factory returns an IDatabase that can be _reset().

- initialize_2() now takes an optional `testing` argument, defaulting to
  False.  The test ConfigLayer will pass in True.

- Remove _reset() from the base database class.

- The ModelMeta now adds a PRESERVE attribute to database classes.  This
  defaults to False, meaning by default the test framework will reset the
  table.  The Version table is preserved because it records the schema
  migrations.

- Because of the above, we no longer need to support pre_reset() and
  post_reset() on migrations.

Also, bin/mailman should allow the standard configuration file search
algorithm to be used except when -C/--config is given.

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