This commit should fix the following acceptance test failures:
=== RUN TestAccAzureDnsServerBasic
--- FAIL: TestAccAzureDnsServerBasic (2.17s)
testing.go:172: Step 0 error: Error applying: 1 error(s) occurred:
* azure_dns_server.foo: Failed issuing update to network
configuration: Error response from Azure. Code: BadRequest,
Message: Multiple DNS servers specified with the same name
'terraform-dns-server'.
=== RUN TestAccAzureDnsServerUpdate
--- FAIL: TestAccAzureDnsServerUpdate (2.04s)
testing.go:172: Step 0 error: Error applying: 1 error(s) occurred:
* azure_dns_server.foo: Failed issuing update to network
configuration: Error response from Azure. Code: BadRequest,
Message: Multiple DNS servers specified with the same name
'terraform-dns-server'.