change #stub! to #stub
change #stub! to #stub

 * preparing for warnings from RSpec upgrade

cloudfoundry-incubator/bosh-aws-cpi-release,wcamarao/bosh-aws-cpi-release,jfuerth/bosh-aws-cpi-release,jfuerth/bosh-aws-cpi-release,cloudfoundry-incubator/bosh-aws-cpi-release,wcamarao/bosh-aws-cpi-release,tracyde/bosh-aws-cpi-release,cloudfoundry-incubator/bosh-aws-cpi-release,tracyde/bosh-aws-cpi-release,jfuerth/bosh-aws-cpi-release,wcamarao/bosh-aws-cpi-release,tracyde/bosh-aws-cpi-release