Config options: centralize vif libvirt options (6)

The config options of the "nova.conf" section "libvirt" got
moved to the new central location "nova/conf/libvirt.py".
Subsequent patches will then move another options in libvirt section.
This is the 6th patch in a long-chain patchs.

Change-Id: I9c182f49711a54e140c6321aa56c72850bc4d1a3
Co-Authored-by: Markus Zoeller <mzoeller@de.ibm.com>
Implements: blueprint centralize-config-options-newton

nova/conf/libvirt.py

@@ -284,12 +284,19 @@ libvirt_utils_opts = [
                      'currently applies exclusively to qcow2 images'),
 ]
 
+libvirt_vif_opts = [
+    cfg.BoolOpt('use_virtio_for_bridges',
+                default=True,
+                help='Use virtio for bridge interfaces with KVM/QEMU'),
+]
+
 ALL_OPTS = list(itertools.chain(
     libvirt_general_opts,
     libvirt_imagebackend_opts,
     libvirt_imagecache_opts,
     libvirt_lvm_opts,
     libvirt_utils_opts,
+    libvirt_vif_opts,
 ))
 
 

nova/virt/libvirt/vif.py

@@ -21,7 +21,6 @@ import copy
 
 import os
 from oslo_concurrency import processutils
-from oslo_config import cfg
 from oslo_log import log as logging
 
 import nova.conf
@@ -38,14 +37,7 @@ from nova.virt import osinfo
 
 LOG = logging.getLogger(__name__)
 
-libvirt_vif_opts = [
-    cfg.BoolOpt('use_virtio_for_bridges',
-                default=True,
-                help='Use virtio for bridge interfaces with KVM/QEMU'),
-]
-
 CONF = nova.conf.CONF
-CONF.register_opts(libvirt_vif_opts, 'libvirt')
 
 # vhostuser queues support
 MIN_LIBVIRT_VHOSTUSER_MQ = (1, 2, 17)
@@ -728,7 +720,7 @@ class LibvirtGenericVIFDriver(object):
                     ip6_addr = ips['address']
 
         ptype = 'NovaVMPort'
-        if (cfg.CONF.libvirt.virt_type == 'lxc'):
+        if (CONF.libvirt.virt_type == 'lxc'):
             ptype = 'NameSpacePort'
 
         cmd_args = ("--oper=add --uuid=%s --instance_uuid=%s --vn_uuid=%s "

nova/virt/opts.py

@@ -12,7 +12,6 @@
 
 import itertools
 
-import nova.virt.libvirt.vif
 import nova.virt.libvirt.volume.aoe
 import nova.virt.libvirt.volume.glusterfs
 import nova.virt.libvirt.volume.iscsi
@@ -35,7 +34,6 @@ def list_opts():
     return [
         ('libvirt',
          itertools.chain(
-             nova.virt.libvirt.vif.libvirt_vif_opts,
              nova.virt.libvirt.volume.volume.volume_opts,
              nova.virt.libvirt.volume.aoe.volume_opts,
              nova.virt.libvirt.volume.glusterfs.volume_opts,