Remove unused modules copied from oslo-incubator

No longer needed since we moved to oslo.utils and
oslo.serialization and updated to latest oslo-incubator.
As part of the cleanup removed the hack for gettextutils
since the oslo-incubator code no longer uses it

Change-Id: Ib020cd4c3464f1c994a6d77f4b894f41b99e6d02
Merge "Remove unused modules copied from oslo-incubator"