Logical port creation is a POST request. Sometimes it will trigger
ConnectionResetError which is a IOError. request_with_retry_on_ssl_error
will retry it.
If request has parameter retry_confirm, exception will be raised so ncp
could query if port has been created to avoid creating port twice.
Change-Id: Ic97b39c7a3736f02a79ab891970c1ad67b123156
ac224a85a8