Also it is not need to pass a list, example:
```
(setq dotspacemacs-configuration-layers
'((auto-completion :disabled-for org git)))
```
Will disable auto-completion for org and git layers.
Example:
(setq dotspacemacs-configuration-layers
'((auto-completion :disabled-for (org))))
Will not run any org/pre-init-xxx or org/post-init-xxx functions where
xxx is a package owned by the auto-completion layer.
Limitation:
If ownership of an auto-completion package P is stolen by another layer L
then :disabled-for must also be declared with L, otherwise the P will
be configured for org.
(setq dotspacemacs-configuration-layers
'((auto-completion :disabled-for (org))
(L :disabled-for (org)))
The user should not change the default owner of a layer unless really
required (for instance to use his own fork).
