refactor unittest framework

as a result, there's another SUITE that needs to run

src/main/scala/coreplex/UnitTest.scala

@@ -1,26 +0,0 @@
-package coreplex
-
-import Chisel._
-import unittest.UnitTestSuite
-import rocket.Tile
-import uncore.tilelink.TLId
-import cde.Parameters
-
-class UnitTestCoreplex(tp: Parameters, tc: CoreplexConfig) extends Coreplex()(tp, tc) {
-  require(tc.nSlaves == 0)
-  require(tc.nMemChannels == 0)
-
-  io.master.mmio.foreach { port =>
-    port.acquire.valid := Bool(false)
-    port.grant.ready := Bool(false)
-  }
-
-  io.debug.req.ready := Bool(false)
-  io.debug.resp.valid := Bool(false)
-
-  val l1params = p.alterPartial({ case TLId => "L1toL2" })
-  val tests = Module(new UnitTestSuite()(l1params))
-
-  override def hasSuccessFlag = true
-  io.success.get := tests.io.finished
-}