Remove Py26 from Libra in Zuul
Remove Py26 from Libra in Zuul

Change-Id: I249f2b7c4293c1528f276bd097b247609d9b034a
Reviewed-on: https://review.openstack.org/14950
Approved: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Reviewed-by: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Tested-by: Jenkins

coolsvap/project-config,Tesora/tesora-project-config,anbangr/osci-project-config,dongwenjuan/project-config,openstack-infra/project-config,osrg/project-config,open-switch/infra_project-config,noorul/os-project-config,anbangr/osci-project-config,citrix-openstack/project-config,coolsvap/project-config,openstack-infra/project-config,citrix-openstack/project-config,Tesora/tesora-project-config,noorul/os-project-config,osrg/project-config,dongwenjuan/project-config,open-switch/infra_project-config