Sync latest versionutils from oslo-incubator

Sync latest versionutils to let us add warning for deprecated class in
Kilo. This also syncs its dependency module log and _i18n.

versionutils:
5d40e14 Remove code that moved to oslo.i18n
1c3ecfc Enhance versionutils.deprecated to work with classes
9a46271 Add Kilo release name to versionutils
a2ad3a2 Allow deprecated decorator to specify no plan for removal
05ae498 Add JUNO as a target to versionutils module
de4adbc pep8: fixed multiple violations

log:
ac4330d Make use_syslog=True log to syslog via /dev/log
df774ff Import PublishErrorsHandler from oslo.messaging
a3220c5 add list_opts to all modules with configuration options
6c706c5 Delete graduated serialization files
5d40e14 Remove code that moved to oslo.i18n
6ff6b4b Switch oslo-incubator to use oslo.utils and remove old modules
aa74411 log: add missing space in error message

Change-Id: I9c1911e666e603d306685ff8bea390830c656256
Merge "Sync latest versionutils from oslo-incubator"