3174.v2c9e67f8f9df

🚀 New features and improvements

• Better logging of controller URL from JnlpAgentEndpointResolver (#683) @jglick

📝 Documentation updates

• Deprecating PermanentConnectionRefusalException (#680) @jglick

👻 Maintenance

• Updating comment in SocketChannelStream about JDK-8222774 (#681) @jglick
• Logging about TCP protocol events (#682) @jglick
• Use Java 11 method where possible (#678) @basil

🚦 Tests

• Need to use @Ignore on JUnit 4, @Disabled on 5 (#679) @jglick
• JENKINS-72163 - Add tests for agent endpoint resolution retries (#608) @Vlatombe