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LAST BUILD ON BRANCH issue586

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ssl: fix OpenSSL modes to correct non-blocking behavior

OpenSSL changed the default in v1.1.1 of SSL_MODE_AUTO_RETRY from off to
on. Because rabbitmq-c uses non-blocking calls internally, this must be
disabled.

Additionally turn on SSL_MODE_ENABLE_PARTIAL_WRITE to allow SSL_write to
return before a full frame is written. This is likely a latent bug that
hasn't been found until recently.

Fixes #586