When getting status of NetworkManager via 'nmcli nm ...' and NetworkManager
is not running, do not call its D-Bus methods. It prevents NM to be implicitly
executed when configured as D-Bus activated service.
'enable' command queries and sets NetworkingEnabled property. It should be used
by users. Previous 'sleep' command that actually did enable/disable,
really calls Sleep() now and is not meant for common usage.
Modifications are mainly for multiline mode to ease parsing - each
field name is prefixed with a section name.
'dev list' now also supports printing particular sections specifed via
'--fields' option.
