Sync oslo-incubator

Sync the latest modules: cliutils, log, fixture, service, periodic_task
from oslo-incubator, and remove the unused modules. The latest
oslo-incubator commit is: 00b58d55e6b9dc3a0ce4f3978644dfcec7acf224

Change-Id: I1054deeda872ae71310b13f283025596917853bc
Merge "Sync oslo-incubator"