Request object for node adopt operation

This adds a new request object for node adopt operation

Blueprint: senlin-adopt-function
Change-Id: I5be76505c5ce63f489afd677436a8b274de1c8b6

senlin/objects/requests/nodes.py

@@ -107,3 +107,15 @@ class NodeOperationRequest(base.SenlinObject):
         'operation': fields.StringField(),
         'params': fields.JsonField(nullable=True)
     }
+
+
+@base.SenlinObjectRegistry.register
+class NodeAdoptRequest(base.SenlinObject):
+
+    fields = {
+        'identity': fields.StringField(),
+        'type': fields.StringField(),
+        'overrides': fields.JsonField(nullable=True),
+        'preview': fields.BooleanField(default=True),
+        'snapshot': fields.BooleanField(default=False)
+    }

senlin/tests/unit/objects/requests/test_nodes.py

@@ -206,3 +206,22 @@ class TestNodeOperation(test_base.SenlinTestCase):
         self.assertEqual('test-node', sot.identity)
         self.assertEqual('dance', sot.operation)
         self.assertEqual({'foo': 'bar'}, sot.params)
+
+
+class TestNodeAdopt(test_base.SenlinTestCase):
+
+    body = {
+        'identity': 'test-node',
+        'type': 'test-type',
+        'overrides': {'foo': 'bar'},
+        'preview': False,
+        'snapshot': True
+    }
+
+    def test_node_adopt_request(self):
+        sot = nodes.NodeAdoptRequest(**self.body)
+        self.assertEqual('test-node', sot.identity)
+        self.assertEqual('test-type', sot.type)
+        self.assertEqual({'foo': 'bar'}, sot.overrides)
+        self.assertFalse(sot.preview)
+        self.assertTrue(sot.snapshot)