server.ssl.key-alias is ignored when configuring Netty #19197
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Closes gh-17944
Followed similar approach as in
org.springframework.boot.web.embedded.jetty.SslServerCustomizer
by wrapping the returned key managers with a version that supports looking up by alias. It was one level deeper as Netty passes the KeyManagerFactory, not the KeyManagers down into the bowels of SSL. With this change, the KeyManagerFactory actually returns the wrapped KeyManagers via its SPI.Verified that an invalid alias name does the same exception at runtime as reported by #16168. They are in parity w/ this change.