Unit tests: Ignore member classes

I have checked all classes including "$" in their name in the output dir
"build-test": None of them are actual unit tests, they all have an
@Ignore in the source code already.

This fixes the following failure:

[junit] Testsuite: plugins.WebOfTrust.SubscriptionManagerFCPTest$1
[junit] Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed:
0.024 sec
[junit] Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed:
0.024 sec
[junit]
[junit] Testcase: initializationError took 0.002 sec
[junit]     Caused an ERROR
[junit] Test class should have exactly one public constructor
[junit] java.lang.Exception: Test class should have exactly one public
constructor
[junit]     at
java.lang.reflect.Constructor.newInstance(Constructor.java:526)