Update some log calls for translation and lazyness

Update log calls to use _LI and friends.
Follow oslo.i18n recommendation to use "," instead of % so that
lazy evaluation of debug messages is possible.

For details about tagging, see http://docs.openstack.org/developer/oslo.i18n/guidelines.html#log-translation

Partial-Bug: #1379001

Change-Id: I4aff674555945e6097283770fe77abecfebd740e
Merge "Update some log calls for translation and lazyness"