Move configuration of lookup merge behavior into Hiera lookup_options. #99
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This fixes my issue #98 in a way that provides a (I think) sane default, and allows easy per-user overrides. With the basics setup, this could also be the base of moving all of the default values from params.pp into a few yaml files.
My inputs are very simple and have no problems also being merged this way - but its possible for more complicated setups that the inputs should stay with normal deep merge without the 'merge_hash_arrays' enabled by default.