These two newly parsed station info params "inactive time" and the
"connected time" would be helpful to track the duration (in ms) for
which the station was last inactive and the total duration (in s) for
which the station is currently connected to the AP.
When the wlan device is in STA mode, these fields represent the info
of this station device. And when wlan device is in AP mode, then these
fields repesents the stations that are connected to this AP device.
For now this module serves as a helper for printing diagnostic
dictionary values. The new API (diagnostic_display) takes a
Dbus iterator which has been entered into a dictionary and
prints out each key and value. A mapping struct was defined
which maps keys to types and units. For simple cases the mapping
will consist of a dbus type character and a units string,
e.g. dBm, Kbit/s etc. For more complex printing which requires
processing the value the 'units' void* cant be set to a
function which can be custom written to handle the value.
