Fix wrong method call in `client_spec` integration test
Fix wrong method call in `client_spec` integration test

[#105338800]https://www.pivotaltracker.com/story/show/105338800)

Signed-off-by: Beyhan Veli <0702de361e3c91d973ce2c0ee3e34845ebaf95e6@sap.com>

cloudfoundry-incubator/bosh-vsphere-cpi-release,nimbus-cloud/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release,nimbus-cloud/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release,nimbus-cloud/bosh-vsphere-cpi-release