Change Lock.name to a property

Change current attribute "name" in Lock class to a read only property to
prevent accidental external changes.

Change-Id: I401dde68aad3aef1b254f2544a56c66fb3ea3e04

tooz/locking.py

@@ -25,7 +25,11 @@ class Lock(object):
     def __init__(self, name):
         if not name:
             raise ValueError("Locks must be provided a name")
-        self.name = name
+        self._name = name
+
+    @property
+    def name(self):
+        return self._name
 
     def __enter__(self):
         self.acquire()

tooz/tests/test_coordination.py

@@ -726,6 +726,11 @@ class TestAPI(testscenarios.TestWithScenarios,
         self.assertFalse(self._coord.is_started)
         self._coord.start()
 
+    def do_test_name_property(self):
+        name = self._get_random_uuid()
+        lock = self._coord.get_lock(name)
+        self.assertEqual(name, lock.name)
+
     @staticmethod
     def _get_random_uuid():
         return str(uuid.uuid4()).encode('ascii')