Modularization

[hrchu]

1. As a library (which depends on radsogw-admin4j) developer, I want to use radsogw-admin4j in the Java 9 modular way (java -p radosgw-admin4j-0.X.X.jar -m com.my.Application for example), so I can declare radsogw-admin4j as named application modules in my module-info.java
2. The build is compatible with Java 8 and provides module-info for Java 9

[hrchu]

Currently we are facing two issues to do this job:

• Our dependencies are not yet modularized, so we got the warning message

Required filename-based automodules detected. Please don't publish this project to a public artifact repository!

from maven compiler plugin

• maven javadoc plugin still has issues on Java 9. https://issues.apache.org/jira/browse/MJAVADOC-498

[hrchu]

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