Replace confusing member name

Replace the member name 'data' in test_object_slo.py and
test_object_temp_url_negative.py with 'content', because 'data' member
is used as a class member name for the instace of DataGenerator in the parent
BaseObjectTest class.

Change-Id: I24f102531afaffd7e797e588777d4621be7a1084
Closes-bug: #1276835
diff --git a/tempest/api/object_storage/test_object_slo.py b/tempest/api/object_storage/test_object_slo.py
index 0443a80..159ad5c 100644
--- a/tempest/api/object_storage/test_object_slo.py
+++ b/tempest/api/object_storage/test_object_slo.py
@@ -59,23 +59,23 @@
         object_name_base_1 = object_name + '_01'
         object_name_base_2 = object_name + '_02'
         data_size = MIN_SEGMENT_SIZE
-        self.data = data_utils.arbitrary_string(data_size)
+        self.content = data_utils.arbitrary_string(data_size)
         self._create_object(self.container_name,
                             object_name_base_1,
-                            self.data)
+                            self.content)
         self._create_object(self.container_name,
                             object_name_base_2,
-                            self.data)
+                            self.content)
 
         path_object_1 = '/%s/%s' % (self.container_name,
                                     object_name_base_1)
         path_object_2 = '/%s/%s' % (self.container_name,
                                     object_name_base_2)
         data_manifest = [{'path': path_object_1,
-                          'etag': hashlib.md5(self.data).hexdigest(),
+                          'etag': hashlib.md5(self.content).hexdigest(),
                           'size_bytes': data_size},
                          {'path': path_object_2,
-                          'etag': hashlib.md5(self.data).hexdigest(),
+                          'etag': hashlib.md5(self.content).hexdigest(),
                           'size_bytes': data_size}]
 
         return json.dumps(data_manifest)
@@ -147,7 +147,7 @@
         self.assertIn(int(resp['status']), test.HTTP_SUCCESS)
         self._assertHeadersSLO(resp, 'GET')
 
-        sum_data = self.data + self.data
+        sum_data = self.content + self.content
         self.assertEqual(body, sum_data)
 
     @test.attr(type='gate')
diff --git a/tempest/api/object_storage/test_object_temp_url_negative.py b/tempest/api/object_storage/test_object_temp_url_negative.py
index 7d26433..8c0a671 100644
--- a/tempest/api/object_storage/test_object_temp_url_negative.py
+++ b/tempest/api/object_storage/test_object_temp_url_negative.py
@@ -69,10 +69,10 @@
 
         # create object
         self.object_name = data_utils.rand_name(name='ObjectTemp')
-        self.data = data_utils.arbitrary_string(size=len(self.object_name),
-                                                base_text=self.object_name)
+        self.content = data_utils.arbitrary_string(size=len(self.object_name),
+                                                   base_text=self.object_name)
         self.object_client.create_object(self.container_name,
-                                         self.object_name, self.data)
+                                         self.object_name, self.content)
 
     def _get_expiry_date(self, expiration_time=1000):
         return int(time.time() + expiration_time)