Revert "Merge pull request #119 from nperron/bug_3925/int/prevent_from_having_no_uuid"

This reverts commit 01b3b42aca470c9f2b15018ae3065e1618c9e951, reversing
changes made to 2ee83c8d1eb29602a977b335609baa4e3b72aa30.

Removing a Pull Request not fixing the issue.
Fixes #3925: Prevent UUID removal when upgrading rudder-agent

* Add script to check UUID of Rudder and CFEngine process, and set 'root' to UUID only during rudder-server-root install but use the script during upgrade

* Add GPLv3 License to new script

* Fix typos and change name check_rudder-ganet to check-rudder-agent

* Remove changes and add comments on rudder-server-root package, Add temporary cron set into rudder-agent postinst and comments for check-rudder-agent

* Add comments in rudder-agent postinst

* Fix wrong files and bizarre logics

* Make sure that the cron fule added in this issue has correct permissions
Merge pull request #127 from Kegeruneku/bug_3925/int/prevent_from_having_no_uuid

Fixes #3925: Prevent UUID removal when upgrading rudder-agent
Merge branch 'branches/rudder/2.4' into branches/rudder/2.6
Merge branch 'branches/rudder/2.6' into branches/rudder/2.7
Merge branch 'branches/rudder/2.7'