Set put_update for compute.v2.server.Server

Updating Servers requires put_update to be set so we use PUT instead of
PATCH.

Change-Id: Ide226d631591b3b528b3f7ea1d335c372f8ead64

openstack/compute/v2/server.py

@@ -32,6 +32,8 @@ class Server(resource.Resource):
     allow_delete = True
     allow_list = True
 
+    put_update = True
+
     # Properties
     access_ipv4 = resource.prop('accessIPv4')
     access_ipv6 = resource.prop('accessIPv6')

openstack/tests/compute/v2/test_server.py

@@ -58,6 +58,7 @@ class TestServer(testtools.TestCase):
         self.assertTrue(sot.allow_update)
         self.assertTrue(sot.allow_delete)
         self.assertTrue(sot.allow_list)
+        self.assertTrue(sot.put_update)
 
     def test_make_it(self):
         sot = server.Server(EXAMPLE)