Add debug output to csv test

To debug timeout:

Timed out log:
http://dash.orfeo-toolbox.org/testDetails.php?test=35623737&build=211129

Good log for comparison:
http://dash.orfeo-toolbox.org/testDetails.php?test=35617301&build=211079

Failing test:
test_039_issue_13749 which references https://hub.qgis.org/issues/13749

Mailing list discussion:
http://lists.osgeo.org/pipermail/qgis-developer/2015-December/thread.html#40581

tests/src/python/test_qgsdelimitedtextprovider.py

@@ -280,9 +280,13 @@ def runTest(file, requests, **params):
         failures.append(msg)
     wanted_data = wanted['data']
     for id in sorted(wanted_data.keys()):
+        print('getting wanted data')
         wrec = wanted_data[id]
+        print('getting received data')
         trec = data.get(id, {})
+        print('getting description')
         description = wrec['description']
+        print('getting difference')
         difference = recordDifference(wrec, trec)
         if not difference:
             print '    {0}: Passed'.format(description)