Pin keystonemiddleware max version
Pin keystonemiddleware max version

To resolve requirements conflicts in most painless way before 6.1 GA
let's ping keystonemiddleware to max version 2.0.0 and in 7.0 we
can remove upper bounds as well update packages in our mirros.

Change-Id: I98055060480a2ef80b9d56a211812e98e27fa2e1
Closes-Bug: #1466733

huntxu/fuel-web,nebril/fuel-web,eayunstack/fuel-web,prmtl/fuel-web,prmtl/fuel-web,eayunstack/fuel-web,eayunstack/fuel-web,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,huntxu/fuel-web,stackforge/fuel-web,prmtl/fuel-web,prmtl/fuel-web,stackforge/fuel-web,huntxu/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,nebril/fuel-web,eayunstack/fuel-web,prmtl/fuel-web,SmartInfrastructures/fuel-web-dev,nebril/fuel-web,SmartInfrastructures/fuel-web-dev,nebril/fuel-web