The demanding grid configuration is shadowed by the one in bob.bio.base
See:
bob.bio.base@2018-01-10 15:41:33,306 -- WARNING: Under the desired name 'demanding', there are multiple entry points defined, we return the first one: ['bob.bio.base.config.grid.demanding', 'bob.bio.spear.config.grid.demanding']
I think the best approach is to rename the demanding one here.