EventSelectorAthenaPool: Add new configuration fragment for CondProxyProvider.

Add a new-style configuration fragment for CondProxyProvider. Need to set the semantics of the InputCollections property to allow for proper merging.

Database/AthenaPOOL/EventSelectorAthenaPool/python/CondProxyProviderConfig.py

+# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+
+# File: EventSelectorAthenaPool/python/CondProxyProviderConfig.py
+# Created: Jun 2020, sss
+# Purpose: Configure CondProxyProvider.
+
+from __future__ import print_function
+
+from AthenaConfiguration.ComponentAccumulator import ComponentAccumulator
+from AthenaConfiguration.ComponentFactory import CompFactory
+
+
+def CondProxyProviderCfg (flags, poolFiles):
+    if not isinstance (poolFiles, list):
+        poolFiles = [poolFiles]
+
+    result = ComponentAccumulator()
+
+    ProxyProviderSvc = CompFactory.ProxyProviderSvc # SGComps
+    pps = ProxyProviderSvc (ProviderNames = ['CondProxyProvider'])
+    result.addService (pps)
+    
+    CondProxyProvider = CompFactory.CondProxyProvider # EventSelectorAthenaPool
+    cpp = CondProxyProvider (InputCollections = poolFiles)
+    result.addService (cpp)
+
+    return result
+    
+
+if __name__ == "__main__":
+    from AthenaCommon.Configurable import Configurable
+    Configurable.configurableRun3Behavior=1
+    from AthenaConfiguration.AllConfigFlags import ConfigFlags
+    ConfigFlags.loadAllDynamicFlags()
+
+    flags1 = ConfigFlags.clone()
+    flags1.lock()
+    acc1 = ComponentAccumulator()
+    acc1.merge (CondProxyProviderCfg (flags1, 'file1'))
+    acc1.merge (CondProxyProviderCfg (flags1, ['file2', 'file3']))
+    acc1.printConfig (summariseProps=True)
+    print ('CondProxyProvider:', acc1.getService('CondProxyProvider'))
+    acc1.wasMerged()
+