Merge pull request #4018 from spigad/master

MonteCarlo
rollback change for new DAO
revert: sitedb certificates
Merge pull request #4019 from mmascher/master

Revert: sitedb certificates
REST config updated to external configuration
Merge pull request #4020 from cinquo/master

REST config updated to external configuration
Adding new resource as layer to handle databases interactions
Merge pull request #4021 from cinquo/master

Adding new resource as layer to handle databases interactions