PLF-5624 : Improve People REST service

Fix description:
- Avoid Hard-code of super user as root in People REST service
PLF-5820: Login History gadget failed to display statistics charts

Fix descripition
	- Correct the version of jqplot
PLF-5012: Info about exo:gadget-groovy annoies server log when starting package in debug mode

Fix description:
- Verify existence of script objects before fetching them
Merge commit '8ec8a03ab5a647e8b5c2c02a9775fc0c5697398e' into HEAD