volume: Migrate 'volume set', 'volume unset' to SDK

Change-Id: Ib5333fe72df741b04c131d4686191f5b4afa7a50
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Depends-on: https://review.opendev.org/c/openstack/openstacksdk/+/992638

Author: stephenfin

openstackclient/tests/functional/volume/v2/test_volume.py

@@ -124,7 +124,7 @@ def test_volume_set_and_unset(self):
             cmd_output["properties"],
         )
         self.assertEqual(
-            'false',
+            False,
             cmd_output["bootable"],
         )
         self.wait_for_status("volume", name, "available")