network: apply bandwidth settings for forward mode=bridge

We previously allowed bandwidth settings when attaching NICs
to networks with forward mode=bridge:

  commit 42a92ee93d
  Author: Daniel P. Berrangé <berrange@redhat.com>
  Date:   Tue Nov 20 11:30:05 2018 +0000

    network: add missing bandwidth limits for bridge forward type

    In the case of a network with forward=bridge, which has a bridge device
    listed, we are capable of setting bandwidth limits but fail to call the
    function to register them.

    Reviewed-by: Cole Robinson <crobinso@redhat.com>
    Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

Unfortunately the wrong version of this patch was posted and
reviewed and thus it lacked the code to actually apply the
bandwidth settings to the bridge itself.

Reviewed-by: Laine Stump <laine@laine.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

src/network/bridge_driver.c

@@ -2743,21 +2743,39 @@ networkShutdownNetworkVirtual(virNetworkDriverStatePtr driver,
 static int
 networkStartNetworkBridge(virNetworkObjPtr obj)
 {
+    virNetworkDefPtr def = virNetworkObjGetDef(obj);
+
     /* put anything here that needs to be done each time a network of
      * type BRIDGE, is started. On failure, undo anything you've done,
      * and return -1. On success return 0.
      */
-    return networkStartHandleMACTableManagerMode(obj, NULL);
+    if (virNetDevBandwidthSet(def->bridge, def->bandwidth, true, true) < 0)
+        goto error;
+
+    if (networkStartHandleMACTableManagerMode(obj, NULL) < 0)
+        goto error;
+
+    return 0;
+
+ error:
+    if (def->bandwidth)
+       virNetDevBandwidthClear(def->bridge);
+    return -1;
 }
 
 
 static int
 networkShutdownNetworkBridge(virNetworkObjPtr obj ATTRIBUTE_UNUSED)
 {
+    virNetworkDefPtr def = virNetworkObjGetDef(obj);
+
     /* put anything here that needs to be done each time a network of
      * type BRIDGE is shutdown. On failure, undo anything you've done,
      * and return -1. On success return 0.
      */
+    if (def->bandwidth)
+       virNetDevBandwidthClear(def->bridge);
+
     return 0;
 }