Add quota validation for server group

- Added a quota constraint for server groups with a default of 2, reducing to 1 when no worker nodes are provisioned.
- Added a quota constraint for server group members, equal to the number of instances provisioned.

pkg/asset/installconfig/openstack/validation/cloudinfo.go

@@ -558,6 +558,8 @@ func getComputeLimits(ctx context.Context, ci *CloudInfo, projectID string) ([]q
 	addQuota("Cores", qs.Cores)
 	addQuota("Instances", qs.Instances)
 	addQuota("RAM", qs.RAM)
+	addQuota("ServerGroups", qs.ServerGroups)
+	addQuota("ServerGroupMembers", qs.ServerGroupMembers)
 
 	return quotas, nil
 }

pkg/asset/quota/openstack/openstack.go

@@ -53,6 +53,13 @@ func Constraints(ci *validation.CloudInfo, controlPlanes []machineapi.Machine, c
 	if len(ci.ControlPlanePortSubnets) == 0 {
 		constraints = append(constraints, networkConstraint(1), routerConstraint(1), subnetConstraint(1))
 	}
+	// if the cluster does not have worker nodes then reduce the server group value from 2 to 1
+	numServerGroups := int64(2)
+	if len(computes) == 0 {
+		numServerGroups--
+	}
+	constraints = append(constraints, serverGroupsConstraint(numServerGroups))
+	constraints = append(constraints, serverGroupMembersConstraint(int64(len(controlPlanes)+len(computes))))
 
 	return aggregate(constraints)
 }
@@ -163,3 +170,11 @@ func generateConstraint(name string, count int64) quota.Constraint {
 		Count: count,
 	}
 }
+
+func serverGroupsConstraint(count int64) quota.Constraint {
+	return generateConstraint("ServerGroups", count)
+}
+
+func serverGroupMembersConstraint(count int64) quota.Constraint {
+	return generateConstraint("ServerGroupMembers", count)
+}