azurerm_virtual_network_gateway: ignoring the case of GatewaySubnet

[YuriyKishchenko]

Azure API allows creation of gateway subnet without specific requirements.
I was able to create Virtual Network Gateways with subnets named gatewaySubnet as well as gatEwaysuBnet

[tombuildsstuff]

hey @YuriyKischenko

Thanks for this PR :)

It'd be good to add an Acceptance Test just to confirm this provisions as expected, but this otherwise LGTM 👍. Terraform's Acceptance Tests consist of two parts: the actual test (here's an example) and the associated Terraform Configuration for that test (example). Providing that passes this should be good to merge :)

[tombuildsstuff]

Tests pass:

[tombuildsstuff]

hey @YuriyKischenko

I hope you don't mind but I pushed a commit to add an acceptance test for this, and this now LGTM as the test passes 👍

Thanks!

[YuriyKishchenko]

Thank you 👍

[ghost]

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