Add support for BGP Configuration on NSX-T Edge Gateways

[Didainius]

This PR adds the initial structure for NSX-T Edge Gateway BGP Configuration. It reflects the "Configuration" tab in UI.

Additional test fixes to make test suite run better:

• Route advertisement code uncovered a VCD flaw with tenant context IDs. Apparently, VCD 10.2.X does not accept URN formatted Org ID (only UUID). VCD 10.3 works fine with both. Commit f57dd01 introduced a global fix for this.
• Some of the previous tests were leaking vApp templates and media items that would break Test_QueryVappTemplateList and Test_CatalogQueryMediaList. These tests are now patched to dump structures for these leaked templates so that they can be caught easier. As a result of this lookup these tests were patched to properly cleanup:
  • Test_AddAndDeleteMetadataOnMediaRecord
  • Test_AddNewVMFromMultiVmTemplate
  • Test_AnswerVmQuestion
• All VCD versions currently have a bug that disables Catalog publishing on Org update. As a result Test_PublishToExternalOrganizations always fails as it assumes that publishing is enabled. To overcome it I added explicit patch for CanPublishCatalogs=true and CanPublishExternally=true before this test run.
• There have been cases when ALB tests were probably hit by timing issues (looks like VCD needs a wait before kicking in a task to enable ALB on Edge Gateway). In this PR test helper setupAlbPoolPrerequisites is patched to perform cleanups better and avoid subsequent test failure. This should help tests to run cleaner and also find potential errors in the future.

[adambarreiro]

LGTM!

[vbauzys]

Nice additions to the main PR topic. Yet, is always a philosophical question that should be in separate PR or not :)

[lvirbalas]

Just one ask and looks great!