ovs/geneve: fix rtnl notifications on iface deletion

BugLink: http://bugs.launchpad.net/bugs/1593235

The function geneve_dev_create_fb() (only used by ovs) never calls
rtnl_configure_link(). The consequence is that dev->rtnl_link_state is
never set to RTNL_LINK_INITIALIZED.
During the deletion phase, the function rollback_registered_many() sends
a RTM_DELLINK only if dev->rtnl_link_state is set to RTNL_LINK_INITIALIZED.

Fixes: e305ac6c ("geneve: Add support to collect tunnel metadata.")
CC: Pravin B Shelar <pshelar@nicira.com>
CC: Jesse Gross <jesse@nicira.com>
CC: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 41009481)
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Acked-by: Thadeu Lima de Souza Cascardo <thadeu.cascardo@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

drivers/net/geneve.c

@@ -1465,6 +1465,10 @@ struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
 	if (err)
 		goto err;
 
+	err = rtnl_configure_link(dev, NULL);
+	if (err < 0)
+		goto err;
+
 	return dev;
 
  err: