factorization, Toolbox::writeConfig()

git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20741 35612d4c-9d10-0410-837c-bf9dd1be60d7
Invalidate Zend OPcache to ensure saved version used 

git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@20742 35612d4c-9d10-0410-837c-bf9dd1be60d7