Fix SSLServer#accept failures causing accept loop to exit.

[ioquatix]

I've observed failures in production in falcon virtual where the proxy stops responding. I believe this is the root cause of the problem - server.accept is failing and (1) killing the accept loop or (2) hanging.

(1) will cause the process to exit and restart, but (2) will cause the proxy to stop accepting new connections which is far more problematic.

This is a regression on io-endopint, as Async::IO::Endpoint implemented this a little differently.

Types of Changes

• Bug fix.

Contribution

• I added tests for my changes.
• I tested my changes locally.
• I agree to the Developer's Certificate of Origin 1.1.