Check_MK Werk 5025: Make communication with smartping helpers more robust

ID: 5025 Title: Make communication with smartping helpers more robust Component: Core & setup Level: 1 Class: Bug fix Version: 1.5.0i1 When the communication between the Micro Core and the smartping helpers (icmpsender/icmpreceiver) fails, we restart the latter, but we forgot to flush an internal buffer. In some cases this could lead to more communication problems later. This has been fixed.