Issue #2885469 by Wim Leers, amateescu, timmillwood, alexpott, tstoeckler,...

Issue #2885469 by Wim Leers, amateescu, timmillwood, alexpott, tstoeckler, xjm, remram, Berdir, dawehner, larowlan, samuel.mortenson: Regression: manually setting the ID field for newly-created content entities is not possible anymore (public follow-up to SA-2017-002)

(cherry picked from commit 4fbf9977)