Jerome Berthier authored Aug 16, 2019 and hydrargyrum committed Oct 01, 2019

Currently when using AbstractModule you need to copy/paste the
whole module CONFIG if you have to add or modify only one Value.

This patch allows an AbstractModule to override one or more
Value from its parent config, avoiding a lot of copy/paste.

Note that if you need to remove one Value, you still need to
copy/paste the whole CONFIG definition.