Werk #11949: agent_siemens_plc: improved agent error handling

Component	Checks & agents
Title	agent_siemens_plc: improved agent error handling
Date	Feb 5, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Improved error messages resulting from failed connections and failed data collection attempts on Siemens PLC devices.

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