Sync requirements with global requirements
Sync requirements with global requirements

Update for pbr to use recent pbr.

Change-Id: I01dc101fecf6589e4600201b92d518e1e23c1fc2

Tesora/tesora-api-site,dreamhost/api-site,dreamhost/api-site,dreamhost/api-site,dreamhost/api-site,Tesora/tesora-api-site,openstack/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,dreamhost/api-site,openstack/api-site,Tesora/tesora-api-site,openstack/api-site,dreamhost/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,dreamhost/api-site,openstack/api-site