Update listCommand.py: optional returnParsedJSON optional arguments

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update listCommand.py: fix optional arguments

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update tool.py: renamed 'gcliList' to 'returnListCommand'

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>