Update oslo-incubator copy to oslo-incubator commit 8b2b0b743

- Remove versionutils as it is not used and it has
  started to pull in oslo.cfg via its direct usage
  of the oslo-incubator log module

Change-Id: I364f00d9734b67fe5c7566ccd7a76e6eb18751c2
Merge "Update oslo-incubator copy to oslo-incubator commit 8b2b0b743"