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_autoconfigure.go

@@ -0,0 +1,61 @@
+package dhcpv4
+
+import (
+	"fmt"
+)
+
+// AutoConfiguration implements encoding and decoding functions for a
+// byte enumeration as used in RFC 2563, Section 2.
+type AutoConfiguration byte
+
+const (
+	DoNotAutoConfigure AutoConfiguration = 0
+	AutoConfigure      AutoConfiguration = 1
+)
+
+var autoConfigureToString = map[AutoConfiguration]string{
+	DoNotAutoConfigure: "DoNotAutoConfigure",
+	AutoConfigure:      "AutoConfigure",
+}
+
+// ToBytes returns a serialized stream of bytes for this option.
+func (o AutoConfiguration) ToBytes() []byte {
+	return []byte{byte(o)}
+}
+
+// String returns a human-readable string for this option.
+func (o AutoConfiguration) String() string {
+	s := autoConfigureToString[o]
+	if s != "" {
+		return s
+	}
+	return fmt.Sprintf("UNKNOWN (%d)", byte(o))
+}
+
+// FromBytes parses a a single byte into AutoConfiguration
+func (o *AutoConfiguration) FromBytes(data []byte) error {
+	if len(data) == 1 {
+		*o = AutoConfiguration(data[0])
+		return nil
+	}
+	return fmt.Errorf("Invalid buffer length (%d)", len(data))
+}
+
+// GetByte parses any single-byte option
+func GetByte(code OptionCode, o Options) (byte, error) {
+	data := o.Get(code)
+	if data == nil {
+		return 0, fmt.Errorf("option not present")
+	}
+	if len(data) != 1 {
+		return 0, fmt.Errorf("Invalid buffer length (%d)", len(data))
+	}
+	return data[0], nil
+}
+
+// OptAutoConfigure returns a new AutoConfigure option.
+//
+// The AutoConfigure option is described by RFC 2563, Section 2.
+func OptAutoConfigure(autoconf AutoConfiguration) Option {
+	return Option{Code: OptionAutoConfigure, Value: autoconf}
+}