Increase timeout of the cross-neutron-tox-py38 job
Increase timeout of the cross-neutron-tox-py38 job

It seems that since some time that job is timing out. To fix that,
this patch sets timeout for the cross-neutron-tox-py38 job to
3600 seconds which is the same value as configured for unit tests
jobs in Neutron.

Change-Id: If360a366b7299e36c80adaefe5baf559a5c16bdd

openstack/oslo.policy