Check_MK Werk 0368: Generating selection id is hopefully now compatible to more systems

ID: 0368 Title: Generating selection id is hopefully now compatible to more systems Component: Multisite Level: 1 Class: Bug Fix Version: 1.2.5i1 The default mechanism to get a selection id is to generate a UUID by reading the contents of the file /proc/sys/kernel/random/uuid. This might be not existing on some special systems. So we use the uuid python module as fallback now.