fix encoding BMPString in x509 name entries (#4321)

Previously we encoded them as UTF-8, but as best I can tell in reality a
BMPString is fixed-width basic multilingual plane big endian encoding.
This is basically UCS-2 (aka original Unicode). However, Python doesn't
support UCS-2 encoding so we need to use utf_16_be. This means you can encode
surrogate code points that are invalid in the context of what a
BMPString is supposed to be, but in reality I strongly suspect the sane
encoding ship has sailed and dozens if not hundreds of implementations
both do this and expect other systems to handle their nonsense.

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