libvirt: remove VIF driver classes deprecated in Icehouse

In Icehouse the old VIF driver classes were set as deprecated
to be removed in Juno. Now they can be finally deleted.

Related-bug: #1302796
Change-Id: I7be735062e6cc6aa54dec1bf43d3cce1ac544988

nova/virt/libvirt/vif.py

@@ -24,7 +24,6 @@
 from nova import exception
 from nova.i18n import _
 from nova.i18n import _LE
-from nova.i18n import _LW
 from nova.network import linux_net
 from nova.network import model as network_model
 from nova.openstack.common import log as logging
@@ -758,36 +757,3 @@ def unplug(self, instance, vif):
             raise exception.NovaException(
                 _("Unexpected vif_type=%s") % vif_type)
         func(instance, vif)
-
-# The following classes were removed in the transition from Havana to
-# Icehouse, but may still be referenced in configuration files.  The
-# following stubs allow those configurations to work while logging a
-# deprecation warning.
-
-
-class _LibvirtDeprecatedDriver(LibvirtGenericVIFDriver):
-    def __init__(self, *args, **kwargs):
-        LOG.warn(_LW('VIF driver \"%s\" is marked as deprecated and will be '
-                     'removed in the Juno release.'),
-                 self.__class__.__name__)
-        super(_LibvirtDeprecatedDriver, self).__init__(*args, **kwargs)
-
-
-class LibvirtBridgeDriver(_LibvirtDeprecatedDriver):
-    pass
-
-
-class LibvirtOpenVswitchDriver(_LibvirtDeprecatedDriver):
-    pass
-
-
-class LibvirtHybridOVSBridgeDriver(_LibvirtDeprecatedDriver):
-    pass
-
-
-class LibvirtOpenVswitchVirtualPortDriver(_LibvirtDeprecatedDriver):
-    pass
-
-
-class NeutronLinuxBridgeVIFDriver(_LibvirtDeprecatedDriver):
-    pass