Keep track gevent block number, remove Benchmark from stats plugin

src/Debug/Debug.py

@@ -70,13 +70,16 @@ import gevent
 import time
 
 
+num_block = 0
 def testBlock():
+    global num_block
     logging.debug("Gevent block checker started")
     last_time = time.time()
     while 1:
         time.sleep(1)
         if time.time() - last_time > 1.1:
             logging.debug("Gevent block detected: %s" % (time.time() - last_time - 1))
+            num_block += 1
         last_time = time.time()
 gevent.spawn(testBlock)