vCloud API returns 403 when querying a no-existing vApp. Add rescue to catch it.
vCloud API returns 403 when querying a no-existing vApp. Add rescue to catch it.

Change-Id: Iff52d6e9c13e27b242fa4eec2c1192157e0af205

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