Werk #10810: check_mk_agent.linux: fixes for ntpq handling

Component	Checks & agents
Title	check_mk_agent.linux: fixes for ntpq handling
Date	Jan 24, 2020
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

This change adds additional verification before executing the respective timesyncd and ntpq calls

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