SocketHandlerTests hangs on new JDKs

Affected test methods:

• SocketHandlerTests#testProtocolChange
• SocketHandlerTests#testTlsConfig

Test fails just on some JDK. Examples:

• test pass on Oracle JDK 11.0.6

  java version "11.0.6" 2020-01-14 LTS
  Java(TM) SE Runtime Environment 18.9 (build 11.0.6+8-LTS)
  Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.6+8-LTS, mixed mode)
  

• test pass on Open JDK 11.0.8

  openjdk version "11.0.8" 2020-07-14
  OpenJDK Runtime Environment 18.9 (build 11.0.8+10)
  OpenJDK 64-Bit Server VM 18.9 (build 11.0.8+10, mixed mode, sharing)
  

• test fails on Oracle JDK 11.0.8

  java version "11.0.8" 2020-07-14 LTS
  Java(TM) SE Runtime Environment 18.9 (build 11.0.8+10-LTS)
  Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.8+10-LTS, mixed mode)
  

This issue is valid at least for branches 2.1 (2.1.17.Final) and master (and probably for 2.2 and 2.3 as well)

Test hangs in "SimpleServer$TcpServer.close" during "socket.close();" call.

org.jboss.logmanager.handlers.SimpleServer$TcpServer.close(SimpleServer.java:127)
org.jboss.logmanager.handlers.SocketHandlerTests.testProtocolChange(SocketHandlerTests.java:129)