RFR 8184904/10, jdk/internal/jrtfs/WithSecurityManager fails with exploded builds

[Felix Yang]

Hi all,

    please review a patch to skip parts of testing with exploded builds.

Bug:

    https://bugs.openjdk.java.net/browse/JDK-8184904

Webrev:

    http://cr.openjdk.java.net/~xiaofeya/8184904/webrev.00/

Thanks,

Felix