Add feature generation support for multi-module projects

[ericglau]

• Track class files from all modules that are in the Gradle multi project build (this should already be done in ci.common but it should be verified as part of this issue)
• In generateFeatures task, if classFiles is null or empty (meaning it is the optimize scenario), pass in all of the Gradle multi project build's classes directories to binary scanner
• Generate the feature list XML file in the server configuration directory that has no other modules depending on it.

This issue depends on #625 to be implemented first.

[pitflash]

Hey,

is there already a plan to implement the devMode support for multi module projects?

I recently migrated a very large project to Gradle. The ability to use Liberty devMode for our large project promises an additional huge increase on the developers productivity.

Regards

Daniel

[cherylking]

@pitflash We have issue #625 open to add multi-module support for dev mode. It's definitely something we want to address.