Addressing review comment (commit to be squashed).

Author: dhermes

gcloud/bigtable/test_row_data.py

@@ -170,12 +170,9 @@ def test_to_dict(self):
         }
 
         result = partial_row_data.to_dict()
-        col1 = family_name1.encode('ascii') + b':' + qual1
-        col2 = family_name1.encode('ascii') + b':' + qual2
-        col3 = family_name2.encode('ascii') + b':' + qual3
         expected_result = {
-            col1: cell1,
-            col2: cell2,
-            col3: cell3,
+            b'name1:col1': cell1,
+            b'name1:col2': cell2,
+            b'name2:col3': cell3,
         }
         self.assertEqual(result, expected_result)