pbr<2.0,>=1.6
oslo.concurrency>=2.3.0 # Apache-2.0
oslo.config>=2.3.0 # Apache-2.0
oslo.log>=1.8.0 # Apache-2.0
oslo.serialization>=1.4.0 # Apache-2.0
oslo.service>=0.9.0 # Apache-2.0
oslo.utils>=2.0.0 # Apache-2.0
six>=1.9.0