Add domain_id parameter to interfaces_attribute map

[mackill54]

Add domain_id to

           ifaceMap := map[string]interface{}{
                    "id":           val.Id,
                    "ip":           val.IP,
                    "mac":          val.MAC,
                    "name":         val.Name,
                    "subnet_id":    val.SubnetId,
                    "primary":      val.Primary,
                    "managed":      val.Managed,
                    "identifier":   val.Identifier,
                    "provision":    val.Provision,
                    "virtual":      val.Virtual,
                    "type":         val.Type,
                    "bmc_provider": val.Provider,
                    "username":     val.Username,
                    "password":     val.Password,

                    "attached_devices": val.AttachedDevices,
                    "attached_to":      val.AttachedTo,
            }

Foreman Satellite cli ( hammer ) allowed attach domain_id to specifed interface
( it can be consume by Foreaman DNS proxy )

https://github.com/theforeman/hammer-cli-foreman/blob/master/doc/host_create.md#common-interface-settings