Werk #13086: Log error messages from the ICMP sender again.

Component	The Checkmk Micro Core
Title	Log error messages from the ICMP sender again.
Date	Jul 19, 2021
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p8 Checkmk Enterprise (CEE), Checkmk MSP (CME)

The CMC didn't pick up any error messages from the ICMP sender, which could in turn result in blocking the sender. This was a regression from 1.6.0.

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