[trac606] corrected a test case. it was intended to test the unlink behavior,

but the original test code was wrong and didn't make sense.

src/bin/bind10/tests/bind10_test.py.in

@@ -435,11 +435,12 @@ class TestPIDFile(unittest.TestCase):
         open(self.pid_file, "w").write('dummy data\n')
         self.check_pid_file()
 
-    def test_dump_pid_notexist(self):
+    def test_unlink_pid_file_notexist(self):
         dummy_data = 'dummy_data\n'
         open(self.pid_file, "w").write(dummy_data)
-        dump_pid('no_such_pid_file')
-        # the original content of the file should be intact.
+        unlink_pid_file("no_such_pid_file")
+        # the file specified for unlink_pid_file doesn't exist,
+        # and the original content of the file should be intact.
         self.assertEqual(dummy_data, open(self.pid_file, "r").read())
 
     def test_dump_pid_with_none(self):