SPY-193: Allow to override wakeupDelay

Motivation
----------
As part of SPY-172, a new wakeupDelay setting has been introduced,
but as part of a mistake it has never been used to actually set
the wakeup time, which is still hardcoded to 1000.

Modifications
-------------
This simple change modifies the code so it accepts the wakeupDelay
setting, still having the default at 1000 but making it possible
to override it through the system property.

Result
------
The wakeupDelay can now be configured via a system property.

Change-Id: If1273cb560d49ea2c9c42b7c7b70c84fd9aeebdc
Reviewed-on: http://review.couchbase.org/75116
Tested-by: Michael Nitschinger <michael@nitschinger.at>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>

Author: daschl

src/main/java/net/spy/memcached/MemcachedConnection.java

@@ -93,7 +93,7 @@ public class MemcachedConnection extends SpyThread {
   private static final int EXCESSIVE_EMPTY = 0x1000000;
 
   /**
-   * The default wakeup delay if not overriden by a system property.
+   * The default wakeup delay if not overridden by a system property.
    */
   private static final int DEFAULT_WAKEUP_DELAY = 1000;
 
@@ -409,7 +409,7 @@ public void handleIO() throws IOException {
     handleInputQueue();
     getLogger().debug("Done dealing with queue.");
 
-    long delay = 1000;
+    long delay = wakeupDelay;
     if (!reconnectQueue.isEmpty()) {
       long now = System.currentTimeMillis();
       long then = reconnectQueue.firstKey();