Bumps version of vcloud api we use 5.1 -> 5.5
Bumps version of vcloud api we use 5.1 -> 5.5

We are going to be using endpoints that are only available in the v5.5+
api versions like `POST /catalog/{id}/action/upload`.

[#99716978](https://www.pivotaltracker.com/story/show/99716978)

Signed-off-by: Liang Biao <840bfc9a5cbdfa07f55e9f6fe0355ea31699536d@huawei.com>

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