allow specification of more diverse kubectl verbs in functional testing

[ilrudie]

What would you like to be added:
Investigate update to functional testing to allow verbs such as kubectl create instead of only supporting apply.

Why is this needed:
Adds capability to the CI to test a more diverse spectra of polices covering a wider variety of changes which might be requested against a cluster.

[ilrudie]

Ideas:

  - manifests
  - test-deploy01.yaml
  - create:"kubectl create blah blah"
  - delete:test-deploy01.yaml

  - kind: deployments
    desired: fail
    script: 
    manifests:
      - test-deploy02.yaml
    singletons:
      - "kubectl create something"

  - kind: deployments
    desired: fail
    script: 
    manifests:
      - test-deploy02.yaml
    creates:
      - "something"