in tango device set cache for few attributes
some control system like BLISS needs to regularly read camera specific attributes to save then as meta-data. Reading for instance energy_threshold takes ~100ms, so reading few attributes can add a non-negligible delay. concerned attributes are:
- auto_summation
- countrate_correction
- flatfield_correction
- retrigger
- energy_threshold
- energy_threshold2
- threshold_diff_mode
- virtual_pixel_correction