Add support for Tesla tests running under 2012 data type

Some Tesla tests, in DaVinci, run using 2012 data and so set the DataType to '2012'. This MR allows Tesla to run with a 2012 data type, with the caveat that this is intended just for the pre-existing tests.

/cc @rmatev

GaudiConf/python/GaudiConf/PersistRecoConf.py

@@ -154,6 +154,9 @@ standardDescriptors['2015'] = OrderedDict(
     for k, v in standardDescriptors['2016'].items()
 )
 
+# We have 2012 descriptors only for running the unit tests
+standardDescriptors['2012'] = standardDescriptors['2016'].copy()
+
 standardDescriptors['2017'] = standardDescriptors['2016'].copy()
 standardDescriptors['2017'].update([
     (i.name, i) for i in [
@@ -268,6 +271,9 @@ standardOutputs['2015']["Hlt2DownstreamRichPIDs"] = (
     "/Event/Hlt2/TrackFitted/Downstream/PID/RICH"
     "/electronmuonpionkaonprotonbelowThreshold/Rich1GasRich2GasDownstream")
 
+# We have 2012 descriptors only for running the unit tests
+standardOutputs['2012'] = standardOutputs['2016'].copy()
+
 # In 2017 we unpack into a prefixed location /Event/Turbo
 standardOutputs["2017"] = {
     "Hlt2LongProtos":           "/Event/Turbo/Long/Protos",
@@ -309,6 +315,8 @@ _externalLocations = [
     '/Event/Raw/Spd/Digits',
 ]
 externalLocations = {}
+# We have 2012 descriptors only for running the unit tests
+externalLocations['2012'] = list(_externalLocations)
 externalLocations['2015'] = list(_externalLocations)
 externalLocations['2016'] = list(externalLocations['2015'])
 # Digits are handled explicitly in 2017