Functional test: Add scenario for testing controller upgrade

[eytan-avisror]

We should have a functional test that guarantees we are not causing a rolling upgrade with a code change.
For example, if a change is made to code around labels / taints / userdata / etc, we can trigger a rolling upgrade for all cluster instance groups.

Scenario should be:

• Deploy controller with tag latest (latest release)
• Create instance-groups
• Deploy controller with tag master (latest PR merged)
• Check if node rotation occurs (-> assert that instancegroup state cannot equal InitUpgrade or ReconcileUpgrade over 30 seconds)