Increase py26 timeouts for nova-stable
Increase py26 timeouts for nova-stable

Seeing repeated timeouts on the current 40 minute limit for jobs
on nova for stable juno.  Increasing to 60.

Change-Id: I8f26714d696928b899b81cb5c2703f00e2185a96

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