Speed up base64 encoding of certs and keys #14405
Merged
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Motivation:
Our SSL tests spend a lot time encoding certs and keys to their PEM representation, which involves base64 encoding. Our tests also run with leak detection enabled, which may trace on every buffer write. That's very slow.
Modification:
When possible, do our base64 encoding through a flattened unpooled buffer. Unpooled buffers don't have leak detection attached to them. We also ensure that our writes only go through a single buffer layer.
Result:
Our netty-handler tests, many of which involve SSL, now run much faster.