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/option_vivc.go

@@ -0,0 +1,65 @@
+package dhcpv4
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/insomniacslk/dhcp/iana"
+	"github.com/u-root/uio/uio"
+)
+
+// VIVCIdentifier implements the vendor-identifying vendor class option
+// described by RFC 3925.
+type VIVCIdentifier struct {
+	// EntID is the enterprise ID.
+	EntID iana.EnterpriseID
+	Data  []byte
+}
+
+// OptVIVC returns a new vendor-identifying vendor class option.
+//
+// The option is described by RFC 3925.
+func OptVIVC(identifiers ...VIVCIdentifier) Option {
+	return Option{
+		Code:  OptionVendorIdentifyingVendorClass,
+		Value: VIVCIdentifiers(identifiers),
+	}
+}
+
+// VIVCIdentifiers implements encoding and decoding methods for a DHCP option
+// described in RFC 3925.
+type VIVCIdentifiers []VIVCIdentifier
+
+// FromBytes parses data into ids per RFC 3925.
+func (ids *VIVCIdentifiers) FromBytes(data []byte) error {
+	buf := uio.NewBigEndianBuffer(data)
+	for buf.Has(5) {
+		entID := iana.EnterpriseID(buf.Read32())
+		idLen := int(buf.Read8())
+		*ids = append(*ids, VIVCIdentifier{EntID: entID, Data: buf.CopyN(idLen)})
+	}
+	return buf.FinError()
+}
+
+// ToBytes returns a serialized stream of bytes for this option.
+func (ids VIVCIdentifiers) ToBytes() []byte {
+	buf := uio.NewBigEndianBuffer(nil)
+	for _, id := range ids {
+		buf.Write32(uint32(id.EntID))
+		buf.Write8(uint8(len(id.Data)))
+		buf.WriteBytes(id.Data)
+	}
+	return buf.Data()
+}
+
+// String returns a human-readable string for this option.
+func (ids VIVCIdentifiers) String() string {
+	if len(ids) == 0 {
+		return ""
+	}
+	buf := bytes.Buffer{}
+	for _, id := range ids {
+		fmt.Fprintf(&buf, " %d:'%s',", id.EntID, id.Data)
+	}
+	return buf.String()[1 : buf.Len()-1]
+}