Introduce an early reporting mechanism for verify and match

It is a good idea to report match results early, to e.g. log in a user
immediately even if more device interaction is needed. Add new _full
variants for the verify/identify functions, with a corresponding
callback. Also move driver result reporting into new
fpi_device_{identify,verify}_report functions and remove the reporting
from the fpi_device_{identify,verify}_complete calls.

Basic updates to code is done in places. Only the upekts driver is
actually modified from a behaviour point of view. The image driver code
should be restructured quite a bit to split the reporting and only
report completion after device deactivation. This should simplifiy the
code quite a bit again.

examples/verify.c

@@ -152,6 +152,7 @@ on_list_completed (FpDevice *dev, GAsyncResult *res, gpointer user_data)
 
       g_print ("Print loaded. Time to verify!\n");
       fp_device_verify (dev, verify_print, NULL,
+                        NULL, NULL, NULL,
                         (GAsyncReadyCallback) on_verify_completed,
                         verify_data);
     }
@@ -205,6 +206,7 @@ start_verification (FpDevice *dev, VerifyData *verify_data)
 
       g_print ("Print loaded. Time to verify!\n");
       fp_device_verify (dev, verify_print, NULL,
+                        NULL, NULL, NULL,
                         (GAsyncReadyCallback) on_verify_completed,
                         verify_data);
     }