[docs] Replace bug classification with the project team guide reference
[docs] Replace bug classification with the project team guide reference

Instead of carrying our of classification, we reference the upstream guide
so that our process is more in line with what the upstream projects are
doing. This makes onboarding and cross-project work easier.

Change-Id: Ia74d49cd8d5fa85ef911a18ad3205410d87c63c1

stackforge/os-ansible-deployment,openstack/openstack-ansible,openstack/openstack-ansible,stackforge/os-ansible-deployment