Lazy gettextutils behavior

gettextutils.enable_lazy() must be called before gettextutils._() is called to
ensure it has the desired lazy lookup behavior. This includes cases, like
keystone.exceptions, where gettextutils._() is called at import time.

Change-Id: I1db293978493868b6f7972b316fb6847c945ee30
Co-Authored-By: David Stanek <dstanek@dstanek.com>
Merge "Lazy gettextutils behavior"