Document CLI env flags override TestSuite file

[kensipe]

The kuttl cli overrides the testsuite file... with the exception of the test env. (this is a require to fix that).

If the kuttl-test.yaml has a configuration for startControlPlane: true and the cli is started with --start-kind.... the cli override should start kind.

Perhaps we should have an override that allows to point at a cluster (currently it is the default that is selected if nothing is provided).

[kensipe]

this isn't true... it is possible to override a configured env with a negative flag... if startControlPlane: true is in the config... we can start with --start-control-plane=false.

Closing!

[kensipe]

Needs Docs!