Drop snappy support from bonanza

[pcapriotti]

Also get rid of the snappy and snappy-framing dependencies.

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[jschaul]

In a few months, we can drop all of bonanza, as we don't use it in the kubernetes world.

I tried to find out if snappy is in use anywhere, I don't think so. If this is merged, CI should do a bump commit like this, and in theory CI should then run the logserver playbook from here.

Feel free to merge, if something about our logging breaks on staging due to this we may need to revert.