Joshua Harlow 97797abb51 Use importutils.try_import for optional eventlet imports ...

Instead of doing try: except ImportError for eventlet imports
use the oslo.utils importutils.try_import function that safely
does the same with less verbosity for the optional usage of
eventlet imports/code that we have.

Change-Id: I7eaa7c5908ffb04282892c9f6af04044b73f4f8c

2015-01-25 11:10:14 -08:00

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