Fix hard code kuryr driver name bug

kuryr driver name is hard coded in zun, if user installed it by
docker plugin install kuryr/libnetwork2, the driver name maybe the
'kuryr/libnetwork2:latest', which will cause create docker fail.

Make the dirver name passed to docker as an conf options, which
default is 'kuryr' as the default driver is kuryr.

Change-Id: I9cc52585950bc44889a3e468476599e27007e8d0
Closes-Bug: #1703383

zun/conf/network.py

@@ -20,6 +20,10 @@ network_opts = [
     cfg.StrOpt('driver',
                default='kuryr',
                help='Defines which driver to use for container network.'),
+    cfg.StrOpt('driver_name',
+               default='kuryr',
+               help=('The network plugin driver name, you can find it by'
+                     ' docker plugin list.')),
 ]
 
 ALL_OPTS = (network_opts)

zun/network/kuryr_network.py

@@ -20,8 +20,12 @@ from oslo_utils import excutils
 from zun.common import clients
 from zun.common import exception
 from zun.common.i18n import _
+import zun.conf
 from zun.network import network
 
+
+CONF = zun.conf.CONF
+
 LOG = logging.getLogger(__name__)
 
 
@@ -54,7 +58,7 @@ class KuryrNetwork(network.Network):
                 "The Neutron network %s has no subnet") % neutron_net_id)
 
         ipam_options = {
-            "Driver": "kuryr",
+            "Driver": CONF.network.driver_name,
             "Options": {},
             "Config": []
         }
@@ -84,7 +88,7 @@ class KuryrNetwork(network.Network):
                   "ipam_options %s, options %s", name, ipam_options, options)
         docker_network = self.docker.create_network(
             name=name,
-            driver='kuryr',
+            driver=CONF.network.driver_name,
             enable_ipv6=True if v6_subnet else False,
             options=options,
             ipam=ipam_options)