[CLI] let OUnit arguments pass through

Summary:
When executing unit tests, don't parse the arguments as they will be
parsed by OUnit.

Reviewed By: skcho

Differential Revision: D20669675

fbshipit-source-id: 897ec10ee

infer/src/base/Config.ml

@@ -453,7 +453,7 @@ let implicit_sdk_root =
 let startup_action =
   let open CLOpt in
   if infer_is_javac then Javac
-  else if !Sys.interactive then NoParse
+  else if !Sys.interactive || String.is_substring ~substring:"inferunit" exe_basename then NoParse
   else if infer_is_clang then NoParse
   else InferCommand