RFR: 8183505: Update langtools tests to allow for unique test classes directory

[Alan Bateman]

On 03/07/2017 21:36, Jonathan Gibbons wrote:
> jtreg has been updated via CODETOOLS-7902003 [1] to use a unique 
> test.classes directory. This is part of improving the reliability when 
> running tests concurrently. The change exposes issues in a small 
> number of tests in the hotspot, jdk, and langtools repos and these 
> issues will need to be fixed before the requiredVersion can be bumped 
> to use a promoted jtreg with this change.
>
> The few changes are all related to deriving the path for the library 
> classes from test.class.path, instead of assuming a fixed relationship 
> to the test's classes.
Looks okay although some tests using endsWith whereas others use 
getFileName().toString(). Either is fine of course.

-Alan