Help texts are filled in.

Signed-off-by: Min Chen <minchnew@gmail.com>
Filter out the line starting OFPST_FLOW when there are thousands of flow.

Signed-off-by: Min Chen <minchnew@gmail.com>
Legacy support: pronto_gre is an old type for GRE tunnel interface.
The GUI will present GRE tunnels of either type pica8_gre or pronto_gre.

Signed-off-by: Min Chen <minchnew@gmail.com>
All bridges share the same Link Aggregation/Tunnel number sequence.

When a new Link Aggregation or a new tunnel is added, the largest
possible sequence number is used.

Signed-off-by: Min Chen <minchnew@gmail.com>