RFR (XXS): 8211045: [Testbug] Fix for 8144279 didn't define a test case!

[David Holmes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8211045
webrev: http://cr.openjdk.java.net/~dholmes/8211045/webrev/

It looks like the original fix forgot to hg add a new test file:

http://cr.openjdk.java.net/~gthornbr/8144279/webrev.00/raw_files/new/test/runtime/jsig/Testjsig.java

So we add that now with some minor edits to update test library usage 
and drop unnecessary -server arg.

Testing: itself

Thanks,
David