Initialize variables in shared static this()

[wilzbach]

If connectMongo with SASL (e.g. SCRAM) is called in a static shared constructor, it will nicely segfault.

[s-ludwig]

Should be both, in shared static this for the main thread, and in static this for other threads. Or, and that's probably the better solution, it could just be created lazily. It currently uses a file descriptor per thread and risks a startup failure even for applications that don't use the SASL authentication.

[wilzbach]

Or, and that's probably the better solution, it could just be created lazily.

Ok. Should I maybe even move this lazy initialization into cryptorand.d as e.g. sha1HashMixer?

[s-ludwig]

That would generally make sense, but I'm not yet sure where the crypto package should be heading, so keeping it private in this module is the safer option for now.