control: Implement service command 'stop,restart,status'. (#2883)

- stop - stops all the servers.
- restart - restart all the servers.
- status - prints status of storage info about the cluster.

cmd/object-handlers.go

@@ -27,18 +27,10 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"sync"
 
 	mux "github.com/gorilla/mux"
 )
 
-var objLayerMutex *sync.Mutex
-var globalObjectAPI ObjectLayer
-
-func init() {
-	objLayerMutex = &sync.Mutex{}
-}
-
 // supportedGetReqParams - supported request parameters for GET presigned request.
 var supportedGetReqParams = map[string]string{
 	"response-expires":             "Expires",