Checkmk Werk 7817: Fix host renaming in WATO

ID: 7817 Title: Fix host renaming in WATO Component: WATO Level: 1 Class: Bug fix Version: 1.7.0i1 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 <tt>Exception: 'Rule' object has no attribute 'host_list'</tt>.