[repo] normalize ValidationError on edited entity (closes #2509729)
In CubicWeb, ValidationError.entity MUST be the eid of the involved entity,
not the entity iteself (as done by yams).
debian/tmp/usr/bin/cubicweb-ctl usr/bin/
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/cwctl.py usr/lib/PY_VERSION/site-packages/cubicweb
debian/cubicweb-ctl.bash_completion etc/bash_completion.d/cubicweb-ctl