A module contains classes, resource files and service provider configuration files that are packaged in a jar file for now; in addition, it may also require native libraries, other properties, etc that are not included in the jar.

6909572 adds a new target for building modules that create a module image and one jar file for each module.

This CR will create one directory for each module containing all other required files in addition to the jar file.

For example, the base module itself can be used to run applications that don't depend other part of the jre. One can simply add another module (e.g. nio module) on top of the base module for applications that depend on nio to run.