Delete test assuming not to be run as root

tests/test_cssread.py

@@ -118,8 +118,6 @@ class CssreadTestCase(unittest.TestCase):
         self.assertListEqual(res[0], self.header_names)
         with self.assertRaises(ValueError):
             cassandra.css_read._header("/dev/null")
-        with self.assertRaises(PermissionError):
-            cassandra.css_read._header("/etc/shadow")
 
     def test_load_css_data(self):
         res_np = cassandra.css_read.load_css_data(self.tmpfile)