Default instances sizes can be too small

[MattiasGees]

Is this a BUG REPORT or FEATURE REQUEST?:

Uncomment only one, leave it on its own line:

/kind bug

/kind feature

What happened:
Ran out of CPU credits for vault and etcd. This caused problems with running a production setup.

What you expected to happen:
Running with default instances should be enough to bring up a production workloads

How to reproduce it (as minimally and precisely as possible):

1. tarmak init
2. tarmak apply

Anything else we need to know?:
Maybe we can tweak the defaults a bit more, but we should also document this a bit better (eg best practices for production)

Environment:

• Kubernetes version (use kubectl version):
• Cloud provider or hardware configuration**:
• Install tools:
• Others: