fix(dhcp): can not renew an ip address

The dhcp server is systemd-networkd, and the dhcp
plugin can request an ip but can not renew it.
The systemd-networkd just ignore the renew request.

```
2024/09/14 21:46:00 no DHCP packet received within 10s
2024/09/14 21:46:00 retrying in 31.529038 seconds
2024/09/14 21:46:42 no DHCP packet received within 10s
2024/09/14 21:46:42 retrying in 63.150490 seconds
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: no more tries
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: renewal time expired, rebinding
2024/09/14 21:47:45 Link "eth1" down. Attempting to set up
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: lease rebound, expiration is 2024-09-14 22:47:45.309270751 +0800 CST m=+11730.048516519
```

Follow the https://datatracker.ietf.org/doc/html/rfc2131#section-4.3.6,
following options must not be sent in renew

- Requested IP Address
- Server Identifier

Since the upstream code has been inactive for 6 years,
we should switch to another dhcpv4 library.
The new selected one is https://github.com/insomniacslk/dhcp.

Signed-off-by: Songmin Li <lisongmin@protonmail.com>

vendor/github.com/insomniacslk/dhcp/dhcpv4/nclient4/lease.go

@@ -0,0 +1,79 @@
+// This is lease support for nclient4
+
+package nclient4
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/insomniacslk/dhcp/dhcpv4"
+)
+
+// Lease contains a DHCPv4 lease after DORA.
+// note: Lease doesn't include binding interface name
+type Lease struct {
+	Offer        *dhcpv4.DHCPv4
+	ACK          *dhcpv4.DHCPv4
+	CreationTime time.Time
+}
+
+// Release send DHCPv4 release messsage to server, based on specified lease.
+// release is sent as unicast per RFC2131, section 4.4.4.
+// Note: some DHCP server requries of using assigned IP address as source IP,
+// use nclient4.WithUnicast to create client for such case.
+func (c *Client) Release(lease *Lease, modifiers ...dhcpv4.Modifier) error {
+	if lease == nil {
+		return fmt.Errorf("lease is nil")
+	}
+	req, err := dhcpv4.NewReleaseFromACK(lease.ACK, modifiers...)
+	if err != nil {
+		return fmt.Errorf("fail to create release request,%w", err)
+	}
+	_, err = c.conn.WriteTo(req.ToBytes(), &net.UDPAddr{IP: lease.ACK.Options.Get(dhcpv4.OptionServerIdentifier), Port: ServerPort})
+	if err == nil {
+		c.logger.PrintMessage("sent message:", req)
+	}
+	return err
+}
+
+// Renew sends a DHCPv4 request to the server to renew the given lease. The renewal information is
+// sourced from the initial offer in the lease, and the ACK of the lease is updated to the ACK of
+// the latest renewal. This avoids issues with DHCP servers that omit information needed to build a
+// completely new lease from their renewal ACK (such as the Windows DHCP Server).
+func (c *Client) Renew(ctx context.Context, lease *Lease, modifiers ...dhcpv4.Modifier) (*Lease, error) {
+	if lease == nil {
+		return nil, fmt.Errorf("lease is nil")
+	}
+
+	request, err := dhcpv4.NewRenewFromAck(lease.ACK, dhcpv4.PrependModifiers(modifiers,
+		dhcpv4.WithOption(dhcpv4.OptMaxMessageSize(MaxMessageSize)))...)
+	if err != nil {
+		return nil, fmt.Errorf("unable to create a request: %w", err)
+	}
+
+	// Servers are supposed to only respond to Requests containing their server identifier,
+	// but sometimes non-compliant servers respond anyway.
+	// Clients are not required to validate this field, but servers are required to
+	// include the server identifier in their Offer per RFC 2131 Section 4.3.1 Table 3.
+	response, err := c.SendAndRead(ctx, c.serverAddr, request, IsAll(
+		IsCorrectServer(lease.Offer.ServerIdentifier()),
+		IsMessageType(dhcpv4.MessageTypeAck, dhcpv4.MessageTypeNak)))
+	if err != nil {
+		return nil, fmt.Errorf("got an error while processing the request: %w", err)
+	}
+	if response.MessageType() == dhcpv4.MessageTypeNak {
+		return nil, &ErrNak{
+			Offer: lease.Offer,
+			Nak:   response,
+		}
+	}
+
+	// Return a new lease with the latest ACK and updated creation time
+	return &Lease{
+		Offer:        lease.Offer,
+		ACK:          response,
+		CreationTime: time.Now(),
+	}, nil
+}