Added context for the MasterClient's methods to avoid endless loops (#5628)

* Added context for the MasterClient's methods to avoid endless loops

* Returned WithClient function. Added WithClientCustomGetMaster function

* Hid unused ctx arguments

* Using a common context for the KeepConnectedToMaster and WaitUntilConnected functions

* Changed the context termination check in the tryConnectToMaster function

* Added a child context to the tryConnectToMaster function

* Added a common context for KeepConnectedToMaster and WaitUntilConnected functions in benchmark

weed/command/master.go

@@ -1,6 +1,7 @@
 package command
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"os"
@@ -218,7 +219,7 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 		}()
 	}
 
-	go ms.MasterClient.KeepConnectedToMaster()
+	go ms.MasterClient.KeepConnectedToMaster(context.Background())
 
 	// start http server
 	var (