RFR: 8244993: Revert changes to OutputAnalyzer stderrShouldBeEmptyIgnoreVMWarnings() that allow version strings

[Daniil Titov]

Please review a webrev [1] that reverts the changes done in jdk.test.lib.process.OutputAnalyzer in [3]. 

Change [3] modified OutputAnalyzer stderrShouldBeEmptyIgnoreVMWarnings() methods to ignore also VM version strings . The current webrev [1] reverts this change and instead makes the tests that expects an empty stderr from launched j-* tools to filter out '-showversion' from test options when forwarding test VM option to j*-tools.

Testing: Mach5 tier1-tier5 tests passed successfully. Tier6-tier7 tests are in progress.

[1]  Webrev:  http://cr.openjdk.java.net/~dtitov/8244993/webrev.01 
[2] Jira issue: https://bugs.openjdk.java.net/browse/JDK-8244993 
[3] https://bugs.openjdk.java.net/browse/JDK-8242009   

Thank you,
Daniil