Bugfix viirs geolocation

When geolocation granule files are not ordered in time,
geolocation got wrong when calling the loader with a list of files

Signed-off-by: Adam.Dybbroe <a000680@c20671.ad.smhi.se>

mpop/satin/viirs_sdr.py

@@ -512,6 +512,7 @@ def read_lonlat(self, geofilepaths=None, geodir=None):
             geofilepaths = [os.path.join(geodir, geofilepath)
                             for geofilepath in self.geo_filenames]
 
+        geofilepaths = sorted(geofilepaths)
         logger.debug("Geo-files = " + str(geofilepaths))
         self.geolocation = ViirsGeolocationData(self.data.shape,
                                                 geofilepaths).read()