There is actuall no runtime depend. There is a build time depend, but
that's taken care of already.
Change-Id: I4bc7b012f9e5dd9f16c67ca3dcdfdeb5e63cd912
The 2.0.0 is breaking in that it removes the use of warnerrors in
build_sphinux.
requestsexceptions isn't using that feature, so it shoudln't break.
The cap on pbr is preventing other OpenStack projects that would like to
use pbr 2.0.0 (and sphinx 1.5.1) from doing so as it breaks
co-installability with requestsexceptions
Change-Id: Id7ed73ec18580a9649f67b42f369c8820573b4a5
Related-Bug: 1668848