switch: minor adjustment of command output

At the end of its output `switch` displays command `switch-status` with
the corresponding arguments that allows to check status of switching.
This patch wraps uri argument of that command with quotes as it may
contain characters that have special meaning for shell, thus it simplify
subsequent call of `switch-status` command because now it can be
copy-pasted from the output as-is.

Closes #TNTP-3886

Author: elhimov

cli/cluster/cmd/failover.go

@@ -163,7 +163,7 @@ func Switch(url string, switchCtx SwitchCtx) error {
 		return err
 	}
 
-	fmt.Printf("%s\n%s %s %s\n",
+	fmt.Printf("%s\n%s '%s' %s\n",
 		"To check the switching status, run:",
 		"tt cluster failover switch-status",
 		url, uuid)