Synced jsonutils from oslo-incubator

The sync includes change that makes sure we get unicode-only dicts from
jsonutils no matter which json module implementation is selected.

The latest commit in oslo-incubator:
- 0f4586c0076183c6356eec682c8a593648125abd

Change-Id: Ic815ca3df94c33edec9104172048b2cd94b92e3f
Closes-Bug: 1314129
Downgrade publisher logging to debug level again

https://review.openstack.org/#/c/33448/ changed those strings from
LOG.debug to LOG.audit without a good explanation. I assume that
this was a temporary change to ease debugging. Since LOG.audit
are spamming syslog and this is logged every few seconds, this
is too much churn and it doesn't provide a useful information for
"audit" level. LOG.debug is a saner choice. Also remove
translation.

Change-Id: I772cc578c39f5c84a5fa68f3567aac54ecc03264
Merge "Downgrade publisher logging to debug level again"
Merge "Synced jsonutils from oslo-incubator"