There is the possibility to change OpenStack config after deployment.
Changes could be applied per role. And in the case of multiple roles
on a node, many changes could pretend to be applied. I.e. if we have
a config for the role 'compute', a config for the role 'cinder' and
a node with role 'cinder+compute' we have to choose one of them.
Previous decision was 'sort it in the lexicographical order', so it
applies 'cinder' then --- 'compute'. It is contra intuitive. The best
option is applying to a node the last related config, to new config
overlaps old ones.