Add default values for qemu max_files and max_proc

If qemu's max_proc / max_file are not defined in reclass, they
don't get defined, which causes qemu to fallback to system limits.

Related-PROD: PROD-35604
Change-Id: I3421ee2e66916203e8049e54bba1895a94c18c46
diff --git a/defaults/openstack/init.yml b/defaults/openstack/init.yml
index b94c540..2e373e4 100644
--- a/defaults/openstack/init.yml
+++ b/defaults/openstack/init.yml
@@ -64,6 +64,8 @@
     nova_version: ${_param:openstack_version}
     nova_upgrade_enabled: ${_param:openstack_upgrade_enabled}
     nova_service_user_enabled: ${_param:openstack_service_user_enabled}
+    qemu_max_processes: 140000
+    qemu_max_files: 35000
     # Glance
     mysql_glance_username: glance
     keystone_glance_username: glance