Makes the vSphere cloud.rb reference a local configuration object, rather than a global singleton.
Makes the vSphere cloud.rb reference a local configuration object, rather than a global singleton.

Signed-off-by: Jesse Zhang <4e375e814be137a4f94f9d2b2a5f4ca930cc7a5a@pivotallabs.com>

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