Unable to cancel/delete clusters in Deploying status

[pupapaik]

Bug description: For unknown reasons my clusters aren't deploying past 1%, and I have no way to cancel/remove them.

Solution:
Most of cloud providers like Azure or GKE do not allow to delete cluster during provisioning, therefore I propose following:

• Put message that clusters cannot be deleted during provisioning (UI)
• Put configurable timeout with default value 1 hour then goes to Error (API - #193)
• Error cluster can be removed, but with confirmation message that user should contact his cloud provider administrator to verify provider side (delete manually if needed) (UI)