Use cf auth instead of cf login
Use cf auth instead of cf login

* cf login will prompt for password on unsuccessful login (even if it's a
connection issue), which we want to avoid.
* cf auth uses the already exported CF_USERNAME and CF_PASSWORD env vars

[#174837918]

Co-authored-by: Mario Nitchev <57ff50f6ddd5ceca6cfb80c4da981adc6ad05ef5@gmail.com>

cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release