RFR 8087307/9, new tests for ServiceLoader updates for module

[Felix Yang]

Hi there,

    please review the new tests added for ServiceLoader updates for 
module system.

Test bug:

    https://bugs.openjdk.java.net/browse/JDK-8087307

Webrev:

    http://cr.openjdk.java.net/~xiaofeya/8087307/webrev.00/

Related product Changes:

    https://bugs.openjdk.java.net/browse/JDK-8132026

    https://bugs.openjdk.java.net/browse/JDK-8047814

Thanks,

Felix