[8] RFR 8028377: test/sun/security/provider/KeyStore/DKSTest.sh attempts to write to ${test.src}

[Vincent Ryan]

Please review the following test fix:

Bug: https://bugs.openjdk.java.net/browse/JDK-8028377
Webrev: http://cr.openjdk.java.net/~vinnie/8028377/webrev.00/

It now writes temporary keystores in the test scratch area
(not the test source area).

Thanks.