Fixes #3915 - Add check for update or uninstall in RPM
Fixes #3915 - Backup of ppkeys and uuid even if upgrade
Merge pull request #118 from nperron/bug_3915/int/add_check_of_update_or_uninstall

Fixes #3915 - Add check for update or uninstall in RPM
Merge branch 'branches/rudder/2.6' into branches/rudder/2.7