Add ContainerDefaultPidsLimit to set default pid limits in containers.conf
Add ContainerDefaultPidsLimit to set default pid limits in containers.conf

Starting With podman 2.X the default pids-limits has been halved from
4096 to 2048 (see the dep-on change Id5d5fb9d20c0295763c78171190b9eda13508617 for
more details).

Let's add a parameter to override this value so an operator can raise
this limit globally.

Depends-On: Id5d5fb9d20c0295763c78171190b9eda13508617
Change-Id: I38a72609e6495b979861105f321b5730669a6a2b

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates