Fixed: Sometimes etcd get service list is error.
Fixed: Sometimes etcd get service list is error.

I use etcd 2.2.5 with docker. It will happen sometimes when i query other service node. The etcd server doesn't refresh dir ttl time, but don't know is refreshed in other version.
So I support removed it temporary.
yzprofile/go-plugins,foxliu20/go-plugins,myodc/go-plugins,yzprofile/go-plugins,micro/go-plugins,foxliu20/go-plugins,micro/go-plugins