Improved receive.go

- Fixed configuration listen-port semantics
- Improved receive.go code for updating listen port
- Updated under load detection, how follows the kernel space implementation
- Fixed trie bug accidentally introduced in last commit
- Added interface name to log (format still subject to change)
- Can now configure the logging level using the LOG_LEVEL variable
- Begin porting netsh.sh tests
- A number of smaller changes

src/misc.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"sync/atomic"
 	"time"
 )
 
@@ -8,10 +9,26 @@ import (
  * (since booleans are not natively supported by sync/atomic)
  */
 const (
-	AtomicFalse = iota
+	AtomicFalse = int32(iota)
 	AtomicTrue
 )
 
+type AtomicBool struct {
+	flag int32
+}
+
+func (a *AtomicBool) Get() bool {
+	return atomic.LoadInt32(&a.flag) == AtomicTrue
+}
+
+func (a *AtomicBool) Set(val bool) {
+	flag := AtomicFalse
+	if val {
+		flag = AtomicTrue
+	}
+	atomic.StoreInt32(&a.flag, flag)
+}
+
 func min(a uint, b uint) uint {
 	if a > b {
 		return b