Fixes #637 - adds tags to azurerm_local_network_gateway

[russellds]

This pull request adds tags to azurerm_local_network_gateway. This addresses issue #637.

[tombuildsstuff]

Hey @russellds

Thanks for this PR - I've taken a look through and this LGTM. I've pushed a couple of commits to document this field and add a test to ensure it's set (I hope you don't mind!).

Tests pass:

$ acctests azurerm TestAccAzureRMLocalNetworkGateway_
=== RUN   TestAccAzureRMLocalNetworkGateway_importBasic
--- PASS: TestAccAzureRMLocalNetworkGateway_importBasic (81.32s)
=== RUN   TestAccAzureRMLocalNetworkGateway_importBGPSettingsComplete
--- PASS: TestAccAzureRMLocalNetworkGateway_importBGPSettingsComplete (78.60s)
=== RUN   TestAccAzureRMLocalNetworkGateway_basic
--- PASS: TestAccAzureRMLocalNetworkGateway_basic (77.83s)
=== RUN   TestAccAzureRMLocalNetworkGateway_disappears
--- PASS: TestAccAzureRMLocalNetworkGateway_disappears (77.98s)
=== RUN   TestAccAzureRMLocalNetworkGateway_tags
--- PASS: TestAccAzureRMLocalNetworkGateway_tags (78.08s)
=== RUN   TestAccAzureRMLocalNetworkGateway_bgpSettings
--- PASS: TestAccAzureRMLocalNetworkGateway_bgpSettings (77.82s)
=== RUN   TestAccAzureRMLocalNetworkGateway_bgpSettingsDisable
--- PASS: TestAccAzureRMLocalNetworkGateway_bgpSettingsDisable (96.06s)
=== RUN   TestAccAzureRMLocalNetworkGateway_bgpSettingsEnable
--- PASS: TestAccAzureRMLocalNetworkGateway_bgpSettingsEnable (94.61s)
=== RUN   TestAccAzureRMLocalNetworkGateway_bgpSettingsComplete
--- PASS: TestAccAzureRMLocalNetworkGateway_bgpSettingsComplete (77.84s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm	740.200s

Thanks!

[russellds]

@tombuildsstuff Thank you! I'll take a look at what you changed to update the documentation so in the future I can make sure I do that as well!

[ghost]

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