v2 - "readOnly" key should be used in schemas

If it has a value of boolean true,
    this keyword indicates that the instance property SHOULD NOT be changed,
    and attempts by a user agent to modify the value of this property are expected to be rejected by a server.
    The value of this keyword MUST be a boolean.
    The default value is false.

    Further link for reference: http://json-schema.org/latest/json-schema-hypermedia.html#anchor15

Closes-Bug: #1521581
Depends-On: I279fba4099667d193609a31259057b897380d6f0
Change-Id: I96717506259c0d28500b8747369c47029b1dd9b6

glanceclient/tests/unit/test_utils.py

@@ -112,7 +112,8 @@ class TestUtils(testtools.TestCase):
         def schema_getter(_type='string', enum=False):
             prop = {
                 'type': ['null', _type],
-                'description': 'Test schema (READ-ONLY)',
+                'readOnly': True,
+                'description': 'Test schema',
             }
 
             if enum: