Limit cluster update properties
Limit cluster update properties

Magnum only allows the node count of cluster being updated. And
in mangum ui, cluster and cluster template are sharing same
function to generating the patch json dict, which is causing lots
of bugs before. So let's define a set for cluster update allowed
properties and use it to restrict the patch json dict.

Task: 26699
Story: 2003865

Change-Id: I2f0126fbf2f7396dda504b988ee11659824fcde8

openstack/magnum-ui,openstack/magnum-ui,openstack/magnum-ui,openstack/magnum-ui