NSX-T ALB Virtual Service Transparent mode and Pool Firewall Group membership (VCD 10.4.1+)

[Didainius]

This PR continues on ALB feature catchup (started in #996), where vcd_nsxt_alb_settings added support for Transparent mode.

This PR adds two new things (both require VCD 10.4.1+):

• vcd_nsxt_alb_virtual_service support for Transparent mode (via field is_transparent_mode_enabled)
• vcd_nsxt_alb_pool Group membership via member_group_id field (members of ALB Pool can come from IP Set instead of being manually enabled)

Note There is quite a list of prerequisites to enable Transparent mode for ALB Virtual Services now. They are well outlined in this blog post (section Transparent Load Balancing) however, I don't think it is worth putting it all in our docs as it may soon get outdated due to this being fresh technology. I also observed that errors are meaningful when creation fails due to missed requirements.

UI views

vcd_nsxt_alb_virtual_service

vcd_nsxt_alb_pool

Testing

• Test leftover cleanup support for all ALB resources added. They must always be removed in reverse order as each of them depend on the parent. The cleanup should look similar to this (I am open to discussion if we need to make the indentation somehow different although it does reflect dependencies correctly):

....
Start leftovers removal
[vcd_nsxt_alb_controller] TestAccVcdNsxtAlbVirtualService (DELETE)
        [vcd_nsxt_alb_cloud] TestAccVcdNsxtAlbVirtualService-alb-cloud (DELETE)
                [vcd_nsxt_alb_service_engine_group] TestAccVcdNsxtAlbVirtualService-se-group (DELETE)
                        [vcd_nsxt_alb_settings] Testnsxt-gw-datacloud (DELETE)
                                [vcd_nsxt_alb_edgegateway_service_engine_group] TestAccVcdNsxtAlbVirtualService-se-group (DELETE)
                                        [vcd_nsxt_alb_pool] TestAccVcdNsxtAlbVirtualService-pool (DELETE)
                                                [vcd_nsxt_alb_virtual_service] TestAccVcdNsxtAlbVirtualService (DELETE)
[vcd_org] System (keep)
[vcd_org] datacloud (keep)
....

Tested on 10.3.0, 10.3.3, 10.4.0, 10.4.1

[adambarreiro]

Thanks for the improvements, just a few doubts