disables tests that fail because toolbox.parse doesn't understand packages yet

the fix looks approachable, especially since we have patched parser
available in the plugin jar. here's the code from master that does the trick:

    def parse(code: String): Tree = {
      reporter.reset()
      val tree = gen.mkTreeOrBlock(newUnitParser(code, "<toolbox>").parseStatsOrPackages())
      throwIfErrors()
      tree
    }