Add pending tasks num to chunkserver status
Add pending tasks num to chunkserver status

myawan/bfs-1,baidu/bfs,lylei/dfs,lylei/dfs,yvxiang/coverage_for_bfs,yvxiang/coverage_for_bfs,baidu/bfs,myawan/bfs-1,bluebore/bfs,linyvxiang/dfs,bluebore/dfs,bluebore/bfs,lylei/dfs,yvxiang/dfs,imotai/bfs,00k/ToyDFS,yvxiang/dfs,00k/ToyDFS,bluebore/dfs,yvxiang/coverage_for_bfs,imotai/bfs,myawan/bfs-1,imotai/bfs,linyvxiang/dfs,lylei/dfs,yvxiang/coverage_for_bfs,linyvxiang/dfs,yvxiang/dfs,bluebore/dfs,baidu/bfs,baidu/bfs,bluebore/bfs,myawan/bfs-1,yvxiang/dfs