Werk #5747: fix daylight saving time error

Component	Reporting & availability
Title	fix daylight saving time error
Date	Mar 8, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p27 Checkmk Enterprise (CEE), Checkmk MSP (CME)

When the actual time was inside/outside the daylight saving time and a report was outside/inside the daylight saving time the calculated time for the last or next scheduled reports was off by 1h. This is fixed now by using the dateutil library internally.

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