RFR (S): 8015497: Take new fixes from hotspot/test/testlibrary to jdk/test/lib/testlibrary

[Yekaterina Kantserova]

Hi,

Could I please have a review of this fix.
The following has been done:
- updated OutputAnalyzer and ProcessTool with changes from 
hotspot/testlibrary;
- added test classes AssertsTest and OutputAnalyzerReportingTest from 
hotspot/testlibrary;
- added InputArguments class from hotspot/testlibrary (provides access 
to the input arguments to the VM);**
- removed JdkFinder (it's replaced with JDKToolLauncher);
- re-wrote JcmdBase to use JDKToolLauncher instead of JdkFinder.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8015497

Webrev:
http://cr.openjdk.java.net/~ykantser/8015497/webrev.00/

Thanks,
Katja