server: enable test of wait_timeout (#14728)
server: enable test of wait_timeout (#14728)


ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,XuHuaiyu/tidb,EvilMcJerkface/tidb,EvilMcJerkface/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,coocood/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,c4pt0r/tidb,kyle-wang/tidb,ngaut/tidb,XuHuaiyu/tidb,kyle-wang/tidb,coocood/tidb,kyle-wang/tidb,Cofyc/tidb,Cofyc/tidb,kyle-wang/tidb,c4pt0r/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb