NX-722: Normalize on use of Junit4

Once POM cleanup happens, the TestSupport should be
used from sisu-goodies/testsupport
use nexus-plugin-testsupport and litmus-testsupport to pickup test dependencies.
notes
Merge pull request #58 from sonatype/NX-722-use-junit4

NX-722: Normalize on use of Junit4