RFR of JDK-8186610,move ModuleUtils to top-level testlibrary

[Alan Bateman]

On 11/10/2018 04:08, Igor Ignatyev wrote:
> Hi Hamlin,
>
> as ModuleTargetHelper uses non-public API, I'd prefer not to have in a common test library, and 8211976 suggests moving it closer to tests. could you please explain why you decided to put it into the library instead?
>
Right, ModuleTargetHelper is just a helper classes in the jlink tests, 
it's not general purpose and not suitable to put into the test 
infrastructure directory.

-Alan