RFR of JDK-8158190: Add test that checks -Xpatch with both Jar and exploded patches

[Hamlin Li]

Would you mind to review the following patch?

bug: https://bugs.openjdk.java.net/browse/JDK-8158190

webrev: http://cr.openjdk.java.net/~mli/8158190/webrev.00/

existing test (test/tools/launcher/modules/patch/basic/PatchTest.java) 
tests 2 scenarios:
1. testWithExplodedPatches, for example, 
patches1/java.base:patches2/java.base
2. testWitJarPatches, for example, 
patches/java.base-1.jar:patches/java-base-2.jar
there should be one more scenario to test mixture of both Jar and 
exploded patches.

Thank you

-Hamlin