bootstrap: tiny clean up. (#3261)
bootstrap: tiny clean up. (#3261)


ngaut/tidb,pingcap/tidb,gaocegege/tidb,Nify/tidb,c4pt0r/tidb,8cbx/tidb,silentred/tidb,8cbx/tidb,wusphinx/tidb,coocood/tidb,pingcap/tidb,wusphinx/tidb,pingcap/tidb,mccxj/tidb,ngaut/tidb,qiuyesuifeng/tidb,c4pt0r/tidb,ngaut/tidb,yangwenmai/tidb,louishust/tidb,louishust/tidb,XuHuaiyu/tidb,ming-relax/tidb,spongedu/tidb,Cofyc/tidb,silentred/tidb,zs634134578/tidb,c4pt0r/tidb,kyle-wang/tidb,kyle-wang/tidb,c4pt0r/tidb,qiuyesuifeng/tidb,ngaut/tidb,pingcap/tidb,ueizhou/tidb,yuanwhy/tidb,gaocegege/tidb,ueizhou/tidb,yangwenmai/tidb,ming-relax/tidb,mccxj/tidb,tiancaiamao/tidb,XuHuaiyu/tidb,kyle-wang/tidb,Nify/tidb,yuanwhy/tidb,kyle-wang/tidb,zs634134578/tidb,Cofyc/tidb,cosmtrek/tidb,ngaut/tidb,kyle-wang/tidb,CodeRushing/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,ngaut/tidb,zimulala/tidb,EvilMcJerkface/tidb,tiancaiamao/tidb,CodeRushing/tidb,cosmtrek/tidb,pingcap/tidb,zimulala/tidb,c4pt0r/tidb,pingcap/tidb,spongedu/tidb,coocood/tidb,kyle-wang/tidb