Upgrade sbt to 0.13.8, simplify build.scala Tasks, generate tests from TestGenerator App, set addons with env variable ROCKETCHIP_ADDONS

src/main/scala/RocketChip.scala

@@ -78,8 +78,6 @@ class Top extends Module with TopLevelParameters {
     val temp = Module(new ZscaleTop)
     io.host <> temp.io.host
   }
-
-  TestGeneration.generateMakefrag
 }
 
 class MultiChannelTop extends Module with TopLevelParameters {

src/main/scala/Testing.scala

@@ -60,7 +60,7 @@ run-$kind-tests: $$(addprefix $$(output_dir)/, $$(addsuffix .out, $targets))
 \t@echo; perl -ne 'print "  [$$$$1] $$$$ARGV \\t$$$$2\\n" if /\\*{3}(.{8})\\*{3}(.*)/' $$^; echo;
 run-$kind-tests-debug: $$(addprefix $$(output_dir)/, $$(addsuffix .vpd, $targets))
 \t@echo; perl -ne 'print "  [$$$$1] $$$$ARGV \\t$$$$2\\n" if /\\*{3}(.{8})\\*{3}(.*)/' $$(patsubst %.vpd,%.out,$$^); echo;
-run-$kind-fast: $$(addprefix $$(output_dir)/, $$(addsuffix .run, $targets))
+run-$kind-tests-fast: $$(addprefix $$(output_dir)/, $$(addsuffix .run, $targets))
 \t@echo; perl -ne 'print "  [$$$$1] $$$$ARGV \\t$$$$2\\n" if /\\*{3}(.{8})\\*{3}(.*)/' $$^; echo;
 """
       } else { "\n" }
@@ -118,3 +118,9 @@ object DefaultTestSuites {
          "bb","bc","bf","bh","bj","bk","bm","bo","br","bs","ce","cf","cg","ci","ck","cl",
          "cm","cs","cv","cy","dc","df","dm","do","dr","ds","du","dv").map(_+"_matmul")).toSet)
 }
+
+object TestGenerator extends App {
+  val gen = () => Class.forName("rocketchip."+args(0)).newInstance().asInstanceOf[Module]
+  chiselMain.run(args.drop(1), gen)
+  TestGeneration.generateMakefrag
+}

src/main/scala/ZscaleChip.scala

@@ -71,6 +71,4 @@ class ZscaleTop extends Module {
   sys.io.host <> io.host
   bootmem.io <> sys.io.bootmem
   dram.io <> sys.io.dram
-
-  TestGeneration.generateMakefrag
 }