Kubernetes: Cluster Setup Tool

[johanhenriksson]

cowait cluster add hello --type kubernetes should start an interactive setup guide that performs the necessary configuration required to run cowait tasks.

• Ask for context name (if not provided)
• Ask for namespace (if not provided, defaults to default)
• Ask for service account name (if not provided, defaults to default)

Then,

• Create namespace
• Create service account
• Create cowait-task role
• Apply cowait-task role to service account

Possibly includes #35