[vcloud_director] fix to input format for post_create_org_vdc_network

Noticed error in input format surrounding IpRanges, where input missing the IpRange elements (instead was just created in Generator)
Add delete_network request
[vcloud_director] fix query test to handle delete_network

workaround really, until we figure out how to clean-room the Mocks on a per-test basis. delete_network was removing the same network we were trying to query in query Test
Merge pull request #2479 from alphagov/vcloud_director_delete_network

[vcloud_director] Add delete_network request
Merge pull request #2487 from alphagov/vcd_fix_post_create_org_vdc_network

[vcloud_director] fix to input format for post_create_org_vdc_network