[lio-py]: Fix help description for lio_node --demomode
[lio-py]: Fix help description for lio_node --demomode

Fixed incorrect help description of default behaviour of lio_node --demomode.

Signed-off-by: Nicholas A. Bellinger <978acd1567d5598152161fdf8bf3ca568f950c9b@linux-iscsi.org>

Datera/lio-utils,Datera/lio-utils,Datera/lio-utils,Datera/lio-utils