Sync with openstack/requirements

Change-Id: I8dd5332f662a082a228365d1c60ee92194cd128a
Sync with openstack/oslo-incubator

Revision 234f64d608266f43d8856ff98c89ceba6699d752

Excludes openstack.common.policy

Change-Id: I06d15da024df08cae25cf89e5f1c37520a5f6ac5
Merge "Sync with openstack/requirements"
Merge "Sync with openstack/oslo-incubator"