Merge branch 'dcampora_delay_xrootd_import' into 'master'

Delay XRootD import to only require it if an eos file is requested

Closes Allen#372

See merge request !3783

PyConf/python/PyConf/utils.py

@@ -8,13 +8,14 @@
 # granted to it by virtue of its status as an Intergovernmental Organization  #
 # or submit itself to any jurisdiction.                                       #
 ###############################################################################
-import os, XRootD.client
+import os
 
 
 def load_file(fname):
     if not fname: return None
 
     if fname.startswith("root://eoslhcb.cern.ch//"):
+        import XRootD.client
         with XRootD.client.File() as f:
             status, _ = f.open(str(fname))
             if not status.ok: