Content type to upload vAppTemplates is application/vnd.vmware.vcloud.uploadVAppTemplateParams+xml'.
[google|compute] Add disk_size_gb to 'Image' model

Added new field to Image model, named diskSizeGb, which shows the
size of the image when it is restored to a persistent disk, in GB.
Fixes attributes when generating xml body for post deploy vapps.
[stormondemand|dns] fixing typo in require statement
[vcloud_director] Add :put_network request

The put_network request updates OrgVdcNetwork details:

- name,
- dns properties,
- gateway

There appear to be some limitations with what the API will allow
to be changes (such as IpRanges) but the input/output of the method
is mapped as usual.

This also adds Mock support for the method.

Network tests have been adjusted so that they work in Mock and Real
mode (bar network_metadata, which is to be implemented in Mock).
Merge pull request #2966 from dbatwa/bug-fixes

VCloud Director - Bug fixes
Merge pull request #2970 from rackspace/typo-fix

[stormondemand|dns] fixing typo in require statement
Merge pull request #2972 from alphagov/put_network

[vcloud_director] Add :put_network request
Add support for tags for Data Pipeline
Merge pull request #2965 from frodenas/gce_images

[google|compute] Add disk_size_gb to 'Image' model
Merge pull request #2973 from accardi/support_tags_for_datapipeline

Add support for tags for Data Pipeline