Werk #7817: Fix host renaming in WATO

Component	Setup
Title	Fix host renaming in WATO
Date	Jun 17, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The host renaming feature was broken for the WATO rules in 1.6.0b1. The function should rename all explicit host names in the rule conditions, but always resulted in an exception like this Exception: 'Rule' object has no attribute 'host_list'.

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