OPENDJ-1936 - don't allow users to configure a JE backend if it is unsupported

Matthew Swift

20.53.2015 c3c61f8a3b4ba1e737253efce1699d0daece0273

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user-friendly-name=Mem\u00f2ria cau d'acc\u00e9s
user-friendly-plural-name=Mem\u00f2ries cau d'acc\u00e9s