PY-23281: Support command line that starts with !

python/testData/testRunner/env/nose/test_with_slow/test_with_slow.py

@@ -0,0 +1,8 @@
+from nose.plugins.attrib import attr
+
+def test_fast():
+    pass
+
+@attr('slow')
+def test_Slow():
+    pass