[migration] stop caching the mapping from constraint type name to eid
It's not so frequent that a cache seems necessary, and we were not
invalidating that cache when adding a new constraint type.
Related to #3724892.
#! /bin/sh -e
#
if [ "$1" = configure ]; then
if which install-docs >/dev/null 2>&1; then
install-docs -i /usr/share/doc-base/cubicweb-doc
fi
fi
#DEBHELPER#
exit 0