dpif-netdev: auto load balance log state on user request.

At present the log displays the auto load balance state
everytime it is changed.

There are some cases where the user will try to enable
auto load balance, but it cannot be enabled because not
enough PMDs or RxQs. As the state does not change, there
is no new log of the state.

While the the last log report of state is still correct,
it is better to log the state again at this point so the
user can explicitly confirm the outcome of their request.

Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>

lib/dpif-netdev.c

@@ -4346,8 +4346,12 @@ dpif_netdev_set_config(struct dpif *dpif, const struct smap *other_config)
     }
 
     struct pmd_auto_lb *pmd_alb = &dp->pmd_alb;
+    bool cur_rebalance_requested = pmd_alb->auto_lb_requested;
     pmd_alb->auto_lb_requested = smap_get_bool(other_config, "pmd-auto-lb",
                               false);
+    if (cur_rebalance_requested != pmd_alb->auto_lb_requested) {
+        log_autolb = true;
+    }
 
     rebalance_intvl = smap_get_int(other_config, "pmd-auto-lb-rebal-interval",
                                    ALB_REBALANCE_INTERVAL);