Building Geode with IntelliJ

[Jens Deppe <je...@apache.org>]

If you've had problems with IntelliJ + Gradle correctly resolving test code
as a dependency in other sub-modules I think I've found (and committed a
fix).

Specifically, the geode-core-test.jar is necessary to build test code in
almost all other submodules. When importing the gradle project, IntelliJ
would correctly recognize a dependency on the jar but wouldn't know or be
able to build it prior to actually needing it. This would mean you'd have
to do a CLI build before being able to build in IntelliJ.

The relevant dependency is now just the geode-core test source and not the
artifacts defined by the test configuration.

Let me know (or raise a Jira) if you still have these issues after this
fix. I've tested with the latest IntelliJ (2016.1.1)

--Jens