wireguard: add wireguard handshake logging

Start the wireguard peer handshake logging in wireguard init script
through lightweight kernel bpf trampoline fentry tracing on wireguard
kernel function.

Signed-off-by: Vincent Li <vincent.mc.li@gmail.com>

src/initscripts/system/wireguard

@@ -353,6 +353,9 @@ wg_start() {
 		setup_interface "${intf}" || failed=1
 	done
 
+	# Start wireguard handshake log
+	loadproc -b wg_handshake
+
 	return ${failed}
 }
 
@@ -366,6 +369,9 @@ wg_stop() {
 		ip link del "${intf##*/}"
 	done
 
+	# Stop wireguard handshake log
+	killproc wg_handshake
+
 	return 0
 }