Upgrade dependency on vCloud Core to 0.13.0
Upgrade dependency on vCloud Core to 0.13.0

Upgrade dependency on vCloud Core to 0.13.0. An error will now be raised
if your `FOG_CREDENTIAL` environment variable does not match the
information stored against a vCloud Director session referred to by
`FOG_VCLOUD_TOKEN`, so as to guard against accidental changes to the
wrong vCloud Director organization.

gds-operations/vcloud-net_launcher,gds-operations/vcloud-net_launcher,gds-operations/vcloud-net_launcher