Update centos-art.sh script.
- Refactor code used to initialize module environments in cli
function through cli_initModule function.
- In order for cli_initModule function to be reusable it is necessary
to define the MODULE_BASEDIR variable inside the most specific
module's configuration file.
- The value verification of TCAR_USER_EDITOR variable was removed
from cli function. I didn't put in centos-art.conf either. So, be
sure to put an existence text editor as value to this variable. By
default, /bin/vi is being used.