ModeShape's credential files in the EAP kit should be placed in the server config dir

When deployed into EAP, ModeShape defines out-of-the-box 2 security-related files: modeshape-user.properties and modeshape-roles.properties. They are used by the ModeShape security domain.

At the moment, those files are placed in modules\org\modeshape\main\conf, making it cumbersome for users to notice/change them.

We should update the kit so that those files are placed in the server's configuration folder.