Change BOSH_USER/PASSWORD to BOSH_CLIENT/SECRET
Change BOSH_USER/PASSWORD to BOSH_CLIENT/SECRET

- Conforms with new BOSH CLI syntax

Signed-off-by: Lyle Franklin <31e283733c7a4b3b6cb03b95ab535671c2112bbe@pivotal.io>

cloudfoundry-incubator/bosh-vcloud-cpi-release,cloudfoundry-incubator/bosh-vcloud-cpi-release,cloudfoundry-incubator/bosh-vcloud-cpi-release