Remove spammy warnings and filecheck info in run_tests.

* This suppresses a warning that arises from using "-m" to launch a module contained in a package that arranges modules via __init__.py. It seems irrelevant to the use case of running doctests.

python/npcomp/utils/test_utils.py

@@ -41,10 +41,7 @@ def end_filecheck_test(main_file):
   filecheck_binary = "FileCheck"
   if _filecheck_binary_var in os.environ:
     filecheck_binary = os.environ[_filecheck_binary_var]
-  print("Using FileCheck binary", filecheck_binary, 
-        "(customize by setting", _filecheck_binary_var, ")", file=sys.stderr)
   filecheck_args = [filecheck_binary, main_file, "--dump-input=fail"]
-  print("LAUNCHING FILECHECK:", filecheck_args, file=sys.stderr)
   p = subprocess.Popen(filecheck_args, stdin=subprocess.PIPE)
   p.communicate(filecheck_input.encode("UTF-8"))
   sys.exit(p.returncode)  

python/run_tests.py

@@ -39,7 +39,7 @@ failed = []
 for test_module in TEST_MODULES:
   print("--------====== RUNNING %s ======--------" % test_module)
   try:
-    subprocess.check_call([sys.executable, "-m", test_module], 
+    subprocess.check_call([sys.executable, "-Wignore", "-m", test_module], 
                           env=CHILD_ENVIRON)
     print("--------====== DONE %s ======--------\n" % test_module)
     passed.append(test_module)