Minor logging tweaks

This change makes UnicastHeader/3 toString() consistent with most other headers by wrapping in "[]"
- And changes two logs for new UNICAST4/NAKACK4 to debug to not be logged by default

- Removed formatting ('[', ']') around headers

src/org/jgroups/protocols/NAKACK4.java

@@ -92,7 +92,7 @@ public void init() throws Exception {
         super.init();
         if(ack_threshold <= 0) {
             ack_threshold=capacity / 4;
-            log.info("defaulted ack_threshold to %d", ack_threshold);
+            log.debug("defaulted ack_threshold to %d", ack_threshold);
         }
     }
 

src/org/jgroups/protocols/NakAckHeader.java

@@ -144,7 +144,7 @@ public static String type2Str(byte t) {
 
     public String toString() {
         StringBuilder ret=new StringBuilder();
-        ret.append("[").append(type2Str(type));
+        ret.append(type2Str(type));
         switch(type) {
             case MSG:
             case XMIT_RSP: // seqno and sender
@@ -157,7 +157,6 @@ public String toString() {
         }
 
         if(sender != null) ret.append(", sender=").append(sender);
-        ret.append(']');
         return ret.toString();
     }
 

src/org/jgroups/protocols/UNICAST4.java

@@ -93,7 +93,7 @@ public void init() throws Exception {
         super.init();
         if(ack_threshold <= 0) {
             ack_threshold=capacity / 4;
-            log.info("defaulted ack_threshold to %d", ack_threshold);
+            log.debug("defaulted ack_threshold to %d", ack_threshold);
         }
     }