Limit number of application security groups in a rule to 1

[hbuckle]

You get the following error if you try and add more than 1 app security group to a rule

network.SecurityRulesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="NumberOfApplicationSecurityGroupsReferencedInSecurityRuleLimitReached" Message="A security rule may have up to 1
Application Security Group in the source or destination fields. The requested configuration has 2 in the SourceApplicationSecurityGroups field."

Fixes #1346

[tombuildsstuff]

Tests pass:

[katbyte]

There is a related open issue: #1346

[tombuildsstuff]

LGTM - thanks for this 👍

[tombuildsstuff]

hi @hbuckle

Just to let you know that is now available in [v1.10 of the AzureRM Provider(https://github.com/terraform-providers/terraform-provider-azurerm/blob/v1.10.0/CHANGELOG.md#1100-july-21-2018) - which you can update to this version by specifying it in the Provider block, like so:

provider "azurerm" {
  version = "=1.10.0"
}

Thanks!

[ghost]

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