Update centos-art.sh script.
    
     - Stop treating Cli as a module. The common functions stored in
       Automation/Modules/Cli/Scripts directory were moved to
       Automation/Scripts directory and Automation/Modules/Cli directory
       was removed.
    
     - The files centos-art.sh, centos-art.conf and centos-art.asciidoc
       were updated to reflect this change.
    
     - Definition of TEXTDOMAIN and TEXTDOMAINDIR variables were moved
       from prepare module's configuration files to cli_initModule
       function. Thus, there is no way to duplicate such definition in
       each module-specific configuration file.
    
     - Definitions of TCAR_MANUAL_READER, TCAR_MANUAL_SEARCHPATH and
       TCAR_MANUAL_FILE were also moved from prepare module's
       configuration files to cli_initModule function.