sun/security/provider/KeyStore/DKSTest.sh fails on Windows when source and jtreg workdir are on different drives

Easily reproducible by setting the workdir (using -w:) to a different drive.

Expected exception: java.io.FileNotFoundException: \\Temp\\sparky\\jib-data\\install\\jdk\\personal\\christian.tornqvist\\2017-05-11-1836062.christian.tornqvist.jdk10-jdk10\\source\\src-full.tar.gz\\jdk\\test\\sun\\security\\provider\\KeyStore\\domains.cfg (The system cannot find the path specified)
java.io.FileNotFoundException: \\Temp\\sparky\\jib-data\\install\\jdk\\personal\\christian.tornqvist\\2017-05-11-1836062.christian.tornqvist.jdk10-jdk10\\source\\src-full.tar.gz\\jdk\\test\\sun\\security\\provider\\KeyStore\\domains.cfg (The system cannot find the path specified)
at java.base/java.io.FileInputStream.open0(Native Method)
at java.base/java.io.FileInputStream.open(FileInputStream.java:196)
at java.base/java.io.FileInputStream.<init>(FileInputStream.java:139)
at java.base/java.io.FileInputStream.<init>(FileInputStream.java:94)
at java.base/sun.security.util.PolicyUtil.getInputStream(PolicyUtil.java:60)
at java.base/sun.security.provider.DomainKeyStore.getBuilders(DomainKeyStore.java:771)
at java.base/sun.security.provider.DomainKeyStore.engineLoad(DomainKeyStore.java:725)
at java.base/sun.security.provider.DomainKeyStore$DKS.engineLoad(DomainKeyStore.java:67)
at java.base/java.security.KeyStore.load(KeyStore.java:1514)
at DKSTest.main(DKSTest.java:83)