Impossible to edit or delete a node through GUI

[xaf-scality]

If a node is created but not deployed we cannot remove it or edit it through the GUI

• delete/edit a node before it is deployed
• update taints/roles of a node
• drain/cordon/uncordon a node for maintenance operation

[thomasdanan]

@xaf-scality we can at least remove the node using kubectl but agree that we should be able to do it from the UI ...

[carlito-scality]

@xaf-scality known issues. See : #917 + #973 + #1230