property_edit_submenu() is the main function. It is entered from main menu by
'goto'
command.
Commands of this menu:
set - set new value to the property
add - add a value to the property (for non-container properties it is
the same as set)
change - allow editing the current property value
remove - remove the property value(s)
describe - show the property description and/or usage
print - show the property value
back - return to the setting level (main menu)
help - show help (command descriptions)
quit - quit nmcli
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