Checkmk Werk 12894: Fix CRE update-config for intallations with CEE-MKPs installed

ID: 12894 Title: Fix CRE update-config for intallations with CEE-MKPs installed Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 CRE istallations with MKPs installed that included files specific to enterprise editions (bakery plugins, for instance) would fail to convert the RRD names during `cmk-update-config`, reporting <i>"AttributeError: module ‘cmk.base.cee’ has no attribute ‘rrd’"</i>.