update bosh_vcloud_cpi gem version
Add the code to build vcloud stemcell.
Add system_vsphere_cdrom stage in vcloud stage
Update the local version number from “0000” to “0” to work around YAML parser issue(removing the duplicate 0).
1.9.3-p448 :003 > Psych.load("version: 0000")
 => {"version"=>0}
Add BAT tests for vcloud stemcell.