Fixes #4147: Enforce creation of UUID at first install
Merge pull request #185 from VinceMacBuche/bug_4147/UUID_at_firstinstall

Fixes #4147: Enforce creation of UUID at first install
Merge branch 'branches/rudder/2.4' into branches/rudder/2.6
Merge branch 'branches/rudder/2.6' into branches/rudder/2.7