Update oslo.config
Update oslo.config

Update oslo.config to 1.2.0a3 it contains a bucket load of
python3 fixes that is needed for py3 compat in python-keystoneclient.

Change-Id: I3bc2e617b97822158ebfa39c021233557282e479
Signed-off-by: Chuck Short <753a8074f04ffd62a8fff7516e3ae689be8e35ad@canonical.com>

metacloud/python-keystoneclient,Mercador/python-keystoneclient,darren-wang/ksc,jamielennox/python-keystoneclient,sdpp/python-keystoneclient,Mercador/python-keystoneclient,magic0704/python-keystoneclient,ntt-sic/python-keystoneclient,metacloud/python-keystoneclient,citrix-openstack-build/python-keystoneclient,citrix-openstack-build/python-keystoneclient,ntt-sic/python-keystoneclient,jamielennox/python-keystoneclient,ging/python-keystoneclient,alexpilotti/python-keystoneclient,ging/python-keystoneclient,klmitch/python-keystoneclient,jamielennox/python-keystoneclient,alexpilotti/python-keystoneclient,klmitch/python-keystoneclient,ntt-sic/python-keystoneclient,darren-wang/ksc,citrix-openstack-build/python-keystoneclient,magic0704/python-keystoneclient,sdpp/python-keystoneclient