THe patch updates the importutils module and uses a per-line module
specification instead of the old modules= options.
Change-Id: Ieb28780bb9034fd61942305ff1eec21b3637027a
Syncs the following changes from stable/folsom:
769ec65 Don't trap then re-raise ImportError.
8c74b37 Improve exception from importutils.import_class().
1fb2361 add import_object_ns function
Change-Id: Ib6046181ec4712702c30c8a8e938fc9a21b1a594