Add methods to convert from server DN class to SDK DN class

Nicolas Capponi

26.20.2014 ced57e8baef55f84fda5b5616aac810d11eb4bfb

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user-friendly-name=Sk\u0142adnia Atrybut\u00f3w
user-friendly-plural-name=Sk\u0142adnie Atrybut\u00f3w