Update directory structure to support Commons functionalities.
- Create `Functions/Commons' directory.
- Rename `cli.sh' to `init.sh'.
- Move all `Functions/cli_*.sh' files into Functions/Commons/
directory. This will let us to work the same functionalities
from different scripts (i.e. It is possible to work in one
unique function file from different working copies.). This is
very useful because it eliminates code duplications.
- Update `centos-art.sh' file to reflect location changes.