Werk #3280: Fixed too often executed network scans

Component	Setup
Title	Fixed too often executed network scans
Date	Mar 9, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The network scan interval was not handled correctly and network scan of a folder could be executed multiple time in parallel if running more than 1 minute.

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