Fog::Compute::VcloudDirector#get_vdc takes ID

Fog::Compute::VcloudDirector#get_vdc takes an ID as its argument[1],
rather than a name.

[1]:
https://github.com/fog/fog/blob/a1c1649d5166da4f7c16a3c89e9121112d3b7a99/lib/fog/vcloud_director/requests/compute/get_vdc.rb#L15
get_organization takes ID rather than a name

Fog::Compute::VcloudDirector#get_organization takes an ID as its
argument[1], rather than a name.

[1]:
https://github.com/fog/fog/blob/16db605f9ae35adfe2b926dee2e4cd669b435455/lib/fog/vcloud_director/requests/compute/get_organization.rb#L15
s/test_data/test_params/

Rename `test_data` to `test_params` for consistency with the
naming of the `Vcloud::Tools::Tester::TestParameters` class.
Use new TestSetup interface to access test params

As of version 0.1.0 of the vCloud Tools Tester gem, we must use the
`Vcloud::Tools::Tester::TestSetup#test_params` method to retrieve test
parameters.

Also, update the gemspec file to reflect this.

* * *

Note that I've intentionally left the `expected_user_params` argument
for `TestSetup#new` empty; this is new functionality that was added in
vCloud Tools Tester version 0.1.0 and is outside the scope of the
current story.
Merge pull request #88 from gds-operations/67916012-integ-setup

[#67916012] Use new TestSetup interface to access test params