Werk #10619: Improve error-handling in poller

Component	Notifications
Title	Improve error-handling in poller
Date	Jan 14, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p9 Checkmk Enterprise (CEE), Checkmk MSP (CME)

Errors from poll(2) were handled inconsistently and could possibly freeze the main loop of the core.

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