Added forced re-initializing of dfs client.
Added forced re-initializing of dfs client.

kod3r/taskgraph,BaiGang/taskgraph,plutoshe/taskgraph,kod3r/taskgraph,fengjingchao/taskgraph,taskgraph/taskgraph,5kg/taskgraph,fengjingchao/taskgraph,plutoshe/taskgraph,dzch/taskgraph,dzch/taskgraph,BaiGang/taskgraph,5kg/taskgraph,taskgraph/taskgraph