JIRA: https://jira.spring.io/browse/INT-4198
Enable setting properties like `needClientAuth` on the `SSLEngine` - when not using
NIO, this can be set on the server socket with a socket support implementation.
Add `nio-connection-support` to namespace.
Improved "Advanced Techniques" documentation, using this use case as an example.
Fail fast with NIO when SSL handshaking fails.
Polishing - PR Comments
More Polishing
* Final polishing
- fix several typos in log messages
- clean up `TcpConnectionFactoryFactoryBean` JavaDocs from redundant imports
- remove redundant `InitializationBean` functionality from the `DefaultTcpNetSSLSocketFactorySupport` as well
a0f0b6ab64