Try turning off parallel so we can see what crashed

Author: dschaefer2

Utilities/bootstrap

@@ -456,8 +456,8 @@ def test(args):
     cmd = [
         os.path.join(args.bin_dir, "swift-test")
     ]
-    if args.parallel:
-        cmd.append("--parallel")
+    #if args.parallel:
+    #    cmd.append("--parallel")
     for arg in args.filter:
         cmd.extend(["--filter", arg])