Prioritize application-level configuration

Reorders rails_config files so app-level files take priority over engine
configuration. The new load order is:

    ./contentqa/config/settings.yml,
    ./contentqa/config/settings/{env}.yml,
    ./contentqa/config/environments/{env}.yml,
    ./contentqa/config/settings.local.yml,
    ./contentqa/config/settings/{env}.local.yml,
    ./contentqa/config/environments/{env}.local.yml,
    ./v1/config/settings.yml,
    ./v1/config/settings/{env}.yml,
    ./v1/config/environments/{env}.yml,
    ./v1/config/settings.local.yml,
    ./v1/config/settings/{env}.local.yml,
    ./v1/config/environments/{env}.local.yml",
    ./config/settings.yml,
    ./config/settings/{env}.yml,
    ./config/environments/{env}.yml,
    ./config/settings.local.yml,
    ./config/settings/{env}.local.yml,
    ./config/environments/{env}.local.yml