Sync oslo-incubator module log:

Pull in new default log level for stevedore.

Generated with: python update.py --base nova ../nova --modules log

Changes:
d9060f6 Check for namedtuple_as_object support before using it
ad248f6 Specify namedtuple_as_object=False when using simplejson
037dee0 Set stevedore log level to WARN by default

Change-Id: Ibe9d2e6e8d97e3199b18ef59c2346a7157574273
Merge "Sync oslo-incubator module log:"