add back "/cluster/status"

fix https://github.com/chrislusf/seaweedfs/issues/870

weed/server/raft_server_handlers.go

@@ -0,0 +1,22 @@
+package weed_server
+
+import (
+	"net/http"
+)
+
+type ClusterStatusResult struct {
+	IsLeader bool     `json:"IsLeader,omitempty"`
+	Leader   string   `json:"Leader,omitempty"`
+	Peers    []string `json:"Peers,omitempty"`
+}
+
+func (s *RaftServer) StatusHandler(w http.ResponseWriter, r *http.Request) {
+	ret := ClusterStatusResult{
+		IsLeader: s.topo.IsLeader(),
+		Peers:    s.Peers(),
+	}
+	if leader, e := s.topo.Leader(); e == nil {
+		ret.Leader = leader
+	}
+	writeJsonQuiet(w, r, http.StatusOK, ret)
+}