BuildRequestor: Reduce delay when client build can't find

a paired tunnel (possible fix for ticket #1412)

router/java/src/net/i2p/router/RouterVersion.java

@@ -18,7 +18,7 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Monotone";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 9;
+    public final static long BUILD = 10;
 
     /** for example "-test" */
     public final static String EXTRA = "-rc";

router/java/src/net/i2p/router/tunnel/pool/BuildRequestor.java

@@ -166,7 +166,10 @@ abstract class BuildRequestor {
             exec.buildComplete(cfg, pool);
             // Not even an exploratory tunnel? We are in big trouble.
             // Let's not spin through here too fast.
-            try { Thread.sleep(250); } catch (InterruptedException ie) {}
+            // But don't let a client tunnel waiting for exploratories slow things down too much,
+            // as there may be other tunnel pools who can build
+            int ms = pool.getSettings().isExploratory() ? 250 : 25;
+            try { Thread.sleep(ms); } catch (InterruptedException ie) {}
             return false;
         }