Werk #5172: Removed CRONTAB configuration option

Component	Site management
Title	Removed CRONTAB configuration option
Date	Sep 1, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The crontab is a mandatory part of a Check_MK site which should never been disabled. For this reason we drop the configuration option now.

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