Migrate promote script to use bosh v2 syntax
Migrate promote script to use bosh v2 syntax

The current scripts assumes usage of bosh v1 cli
cloudfoundry-incubator/bosh-google-cpi-release,cloudfoundry-incubator/bosh-google-cpi-release,cloudfoundry-incubator/bosh-google-cpi-release,cloudfoundry-incubator/bosh-google-cpi-release