[vcloud_director] Deconflate Org name and FullName.
[vcloud_director] Capture org name at login.

Now that name != FullName, this lets us discover which organization
we've logged into without needing advance knowledge of it:

    org = compute.organizations.get_by_name(compute.org_name)
Merge pull request #2143 from nosborn/vcloud_director_org_fullname

[vcloud_director] Deconflate Org name and FullName.