Test fixes (dhcpv6, (vcd_nsxt_edgegateway_dhcpv6, TestAccDataSourceNotFound, BGP Vrf)

[Didainius]

• Removed enabled field in test and some sample snippets of website c5d1073

=== RUN   TestAccVcdIpv6Support
    ipv6_test.go:44: Step 1/1 error: Error running pre-apply refresh: exit status 1

        Error: Unsupported argument

          on terraform_plugin_test.tf line 143, in resource "vcd_nsxt_edgegateway_dhcpv6" "test":                                                               143:   enabled = true
        An argument named "enabled" is not expected here.
--- FAIL: TestAccVcdIpv6Support (2.59s)

• Probably was a corrupt merge 1344ad0

=== RUN   TestAccDataSourceNotFound/vcd_ip_space_uplink
    datasource_not_found_test.go:147: Step 1/1, expected an error with pattern, no match on: Error running pre-apply refresh: exit status 1

        Error: Unsupported argument

          on terraform_plugin_test.tf line 6, in data "vcd_ip_space_uplink" "not-existing":
           6: rde_type_id = "urn:vcloud:type:notexist:notexist:9.9.9"

        An argument named "rde_type_id" is not expected here.
--- FAIL: TestAccDataSourceNotFound (6.73s)
    --- FAIL: TestAccDataSourceNotFound/vcd_ip_space_uplink (0.37s)

• TestAccVcdNsxtEdgeBgpConfigVrf VCD with API V38.0 requires GracefulRestart even if non was presented. The fix is to read existing GracefulRestart values and submit them when user does not provide this configuration. 1522e7a

=== RUN   TestAccVcdNsxtEdgeBgpConfigVrf
    resource_vcd_nsxt_edgegateway_bgp_configuration_test.go:339: Step 1/5 error: Error running apply: exit status 1
        
        Error: error updating NSX-T Edge Gateway BGP Configuration: error setting NSX-T Edge Gateway BGP Configuration: error in HTTP PUT request: BAD_REQUEST - [ dd125787-82be-4d80-b83a-b478462dbd84 ] Cannot change graceful restart configuration if using a VRF-Lite backed external network.
        
          with vcd_nsxt_edgegateway_bgp_configuration.testing,
          on terraform_plugin_test.tf line 56, in resource "vcd_nsxt_edgegateway_bgp_configuration" "testing":
          56: resource "vcd_nsxt_edgegateway_bgp_configuration" "testing" {
        
--- FAIL: TestAccVcdNsxtEdgeBgpConfigVrf (52.49s)

[lvirbalas]

Thanks!