Checkmk Werk 12129: Fix discovered host labels file names

ID: 12129 Title: Fix discovered host labels file names Component: Core & setup Level: 1 Class: Bug fix Version: 2.1.0i1 The discovered host labels of hosts that have a dot in their name were not stored correctly. Instead of "abc.tld.mk" the labels were stored in a file named "abc.mk". The name of these files have now been fixed. During update of Checkmk the names of existing will be checked and updated.