allow sentinel manage_config attribute to control both redis configs as ...

allow sentinel manage_config attribute to control both redis configs as sentinel is responsible for updating both configs upon state change.

There was some talk on flipping the attribute to false upon including the sentinel_enable recipe.  I am not sold on that just yet.  Will need to put some more thought on if we want to control this attribute via inclusion of the sentinel enable recipe or simply leave it up to the user to control.

Either way that is a small adjustment when we make that decision.

Improved readme slightly, bumped version + changelog.