Remove panc-maven-plugin configuration from configuration module pom files
(use definition in parent pom.xml, from maven build tools)

Contributes to https://github.com/quattor/maven-tools/issues/29.
Fix hostsaccess and cups pom files (wrong version of build tools)
Upgrade build tools used to 1.39 (all configuration modules)
Fix pom.xml of several configuration modules (duplicated plugin configuration)
(ncm-authconfig, ncm-ceph, ncm-spma)
All configuration modules: define relativePath restricted to repository in pom.xml
All configuration modules: remove fake contributors

fixes #361.
Update version of build tools used (1.40)
ncm-icinga: reformat source
ncm-icinga: add check for undefined ICINGAUSR and ICINGAGRP
ncm-icinga: mock the ICINGAUSR and ICINGAGRP, cleanup tests