Add validation to resource_group_name field

[tombuildsstuff]

At the moment we're not applying any validation the resource_group_name field apart from in the azurerm_resource_group resource.

Due to the way URL's are constructed in the Azure API's (by prefixing /subscriptions/{subscription_id}/resourceGroups/{name} to each request) - should the ID of a Resource Group be specified instead of it's Name - Azure will return an error about an Invalid API version (unless we're lucky and both API's have the same version).

This results in the following error:

disk.DisksClient#CreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="InvalidApiVersionParameter" Message="The api-version '2016-04-30-preview' is invalid. The supported versions are '2017-06-01,2017-05-10,2017-05-01,2017-03-01,2016-09-01,2016-07-01,2016-06-01,2016-02-01,2015-11-01,2015-01-01,2014-04-01-preview,2014-04-01,2014-01-01,2013-03-01,2014-02-26,2014-04'."

We should update the resource_group_name field across all resources to have validation to check this is a Name and not an ID.

Related bugs: #223 Azure/azure-sdk-for-go#706

[ghost]

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