Add support for Composer IP masq agent flag

[gor-obr]

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Description

Add support for Cloud Composer flag which enables IP masq agent.

https://cloud.google.com/composer/docs/reference/rest/v1beta1/projects.locations.environments
config.nodeConfig.enableIpMasqAgent

New or Affected Resource(s)

google_composer_environment

[gor-obr]

I wish to work on this item.

[ScottSuarez]

cool @gor-obr

So feel free to make these changes locally but when you are ready to commit make a pull request upstream against our repository and tag me on the change!

To work locally you can add the field to the resource here
https://github.com/hashicorp/terraform-provider-google/blob/master/google/resource_composer_environment.go

Then when you are ready to upstream you can make the changes to tests, docs, and resource are the following locations.

Let me know if you have any questions ^^

docs: https://github.com/GoogleCloudPlatform/magic-modules/blob/master/mmv1/third_party/terraform/website/docs/r/composer_environment.html.markdown
test: https://github.com/GoogleCloudPlatform/magic-modules/blob/master/mmv1/third_party/terraform/tests/resource_composer_environment_test.go.erb
resource: https://github.com/GoogleCloudPlatform/magic-modules/blob/master/mmv1/third_party/terraform/resources/resource_composer_environment.go.erb

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