Improve support for Foreman_proxy AD integration#429

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fatmcgav wants to merge 2 commits intotheforeman:masterfrom

fatmcgav:improve_ad_realm_support

Commits on May 15, 2018

Include 'foreman_proxy::plugin::realm::ad' class if 'realm_provider == ad'
fatmcgav
committed

Commits on May 16, 2018

Switch 'realm_provider' back to String datatype
fatmcgav
committed