Re-submit JUnit4 changes to CtsJavaScannerDoclet

Adding back JUnit4 changes to CtsJavaScannerDoclet.

The problem was a missing "!" in the code that recognizes
a JUnit3 test method, so all non-test methods were
being picked up by mistake. This has been tested it with
the existing JUnit3 InstrumentationTestCase tests and a
sample JUnit4 test.

Bug: 15383757
Change-Id: I5e9a5ec72b05f6599fd43f215ecfc38f82c162a3
1 file changed