ofproto-dpif: Install internal rule should not change the match content.

Without this patch, the match passed into to
ofproto_dpif_add_internal_flow() are modified. The mask of dl_type will
always be converted from wildcarded match into exact match due to
calling rule_dpif_lookup_in_table(). The fix makes sure
ofproto_dpif_add_internal_flow() does not change the original match,
and makes the match passed as const in the
ofproto_dpif_add_internal_flow() API.

This bug prevents bond module from properly tracking the post
recirculation rules installed in the internal table. The existing rule
is always deleted followed by reinstalling of the same rule.

The observable behavior of the bug is that bond module losses track
of the slave's stats, after the slave is rebalanced. Although traffic
flows through the slave just fine.

Bug #1229225

Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
netdev: Remove netdev from global shash when the user is changing interface configuration.

When the user changes port type (i.e. changing p0 from type 'internal' to
'gre'), the netdev must first be deleted, then re-created with the new type.
Deleting the netdev requires there exist no more references to the netdev.
However, the xlate cache holds references to netdevs and the cache is only
invalidated by revalidator threads. Thus, if cache is not invalidated prior to
the netdev being re-created, the netdev will not be able to be re-created and
the configuration change will fail.

This patch always removes the netdev from the global netdev shash when the
user changes port type. This ensures that the new netdev can always be created
while handler and revalidator threads can retain references to the old netdev
until they are finished.

Signed-off-by: Ryan Wilson <wryan@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>