provider/openstack: Remove Default Security Group Rules (#11466)

This commit removes the default security group rules that are automatically
created when a security group is created. These rules are usually
permissive egress rules which makes it difficult to add more strict egress
security group rules.

builtin/providers/openstack/resource_openstack_networking_secgroup_v2.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/gophercloud/gophercloud"
 	"github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/security/groups"
+	"github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/security/rules"
 )
 
 func resourceNetworkingSecGroupV2() *schema.Resource {
@@ -70,6 +71,14 @@ func resourceNetworkingSecGroupV2Create(d *schema.ResourceData, meta interface{}
 		return err
 	}
 
+	// Remove the default rules
+	for _, rule := range security_group.Rules {
+		if err := rules.Delete(networkingClient, rule.ID).ExtractErr(); err != nil {
+			return fmt.Errorf(
+				"There was a problem deleting a default security group rule: %s", err)
+		}
+	}
+
 	log.Printf("[DEBUG] OpenStack Neutron Security Group created: %#v", security_group)
 
 	d.SetId(security_group.ID)

builtin/providers/openstack/resource_openstack_networking_secgroup_v2_test.go

@@ -23,6 +23,7 @@ func TestAccNetworkingV2SecGroup_basic(t *testing.T) {
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckNetworkingV2SecGroupExists(
 						"openstack_networking_secgroup_v2.secgroup_1", &security_group),
+					testAccCheckNetworkingV2SecGroupRuleCount(&security_group, 0),
 				),
 			},
 			resource.TestStep{
@@ -89,6 +90,18 @@ func testAccCheckNetworkingV2SecGroupExists(n string, security_group *groups.Sec
 	}
 }
 
+func testAccCheckNetworkingV2SecGroupRuleCount(
+	sg *groups.SecGroup, count int) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+		if len(sg.Rules) == count {
+			return nil
+		}
+
+		return fmt.Errorf("Unexpected number of rules in group %s. Expected %d, got %d",
+			sg.ID, count, len(sg.Rules))
+	}
+}
+
 const testAccNetworkingV2SecGroup_basic = `
 resource "openstack_networking_secgroup_v2" "secgroup_1" {
   name = "security_group"