provider/azurerm: Add azurerm_sql_firewall_rule resource

[stack72]

make testacc TEST=./builtin/providers/azurerm TESTARGS='-run=AzureRMSqlFirewallRule' 2>~/tf.log
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
GO15VENDOREXPERIMENT=1 go generate $(GO15VENDOREXPERIMENT=1 go list ./... | grep -v /vendor/)
TF_ACC=1 GO15VENDOREXPERIMENT=1 go test ./builtin/providers/azurerm -v -run=AzureRMSqlFirewallRule -timeout 120m
=== RUN   TestAccAzureRMSqlFirewallRule_basic
--- PASS: TestAccAzureRMSqlFirewallRule_basic (436.22s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/azurerm    436.237s

The test includes the update of the firewall rule IP addresses

[jen20]

LGTM. Thanks @stack72!

[ghost]

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