Fixes #3998 - Create backup directory in rudder-agent preinst before any action on it
Merge pull request #139 from nperron/bug_3998/int/create_backup_dir_of_rudder_agent

Fixes #3998 - Create backup directory in rudder-agent preinst before any action on it
Merge branch 'branches/rudder/2.4' into branches/rudder/2.6