Remove unused circleci tests (#15466)
Remove unused circleci tests (#15466)

The cloudfoundry test has been migrated to circleci

e2e-simple test does not exist, throwing errors. We agreed to have
build+test+one e2e test so I think its ok to remove.
istio/istio,smawson/istio,smawson/istio,geeknoid/istio,geeknoid/istio,geeknoid/istio,geeknoid/istio,istio/istio,smawson/istio,smawson/istio,geeknoid/istio,smawson/istio,istio/istio,smawson/istio,istio/istio,istio/istio,geeknoid/istio