Werk #5784: WATO Web-API: fixed broken update of host tags

Component	Setup
Title	WATO Web-API: fixed broken update of host tags
Date	Mar 5, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The updating of host tags was no longer working due the recent changes in the host datasource management.

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