RFR: JDK-8217733 Minor RunTest fixes

[Erik Joelsson]

Looks good.

/Erik

On 2019-01-24 06:46, Magnus Ihse Bursie wrote:
> This patch covers some different minor cleanups that I accumulated 
> after working on RunTest:
>  * Do not override JDK_IMAGE_DIR for jcov testing; instead introduce 
> JDK_UNDER_TEST (to be really explicit about which JDK we're testing).
>  * Remove unconditional $(info) printout on Windows
>  * Group JCov variable setup with other variable setups.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8217733
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8217733-minor-RunTest-fixes/webrev.01
>
> /Magnus