Fixes oslo-config update for deprecated_group

Fixes bug: 1140310

The oslo-config dependency referenced in pip-requires should be updated to
the latest version to include support for "deprecated_group".
This is needed to move specific driver options from the DEFAULT group w/o
losing backwards compatibility.

Change-Id: I5d18a5ee704a1f781c8acd6f903b0e3ca07bc070
Merge "Fixes oslo-config update for deprecated_group"