Checkmk Werk 11664: Fix AttributeError on update with nagios core

ID: 11664 Title: Fix AttributeError on update with nagios core Component: Core & setup Level: 1 Class: Bug fix Version: 2.1.0i1 Updating from 1.6.0pxx to 2.0.0b1 could result in an AttributeError "module 'cmk.base' has no attribute 'cee'" in section "Migrating fs_used name". The cause was a wrong check for the used core of the site the update was applied to. If you update to 2.0.0b2 the section will be processed correctly.