v1.6.1: JDK 17 support improvement

JDK 17 improvement

add below java options for JDK 17:

--add-opens java.base/java.net=ALL-UNNAMED
--add-opens java.base/sun.net=ALL-UNNAMED

• remove sun.net.util.IPAddressUtil dependency, simplify JDK 17 usage
  • no need java option --add-opens java.base/sun.net.util=ALL-UNNAMED
• add JDK 17 in appveyor ubuntu CI

Java Dns Cache Manipulator Library

• User Guide & Document
• java apidocs

maven dependency:

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dns-cache-manipulator</artifactId>
    <version>1.6.1</version>
</dependency>

Already deploy to maven central repository.

Java Dns Cache Manipulator Tool

• User Guide & Document
• Download dcm-1.6.1.tar.gz