Filter out invalid ports from the available ports list. The 'Actions'
column of the flow table is now visually friendly.

Signed-off-by: Min Chen <minchnew@gmail.com>
Present Queue configuration of each port in the Monitor tab.

Each port can have multiple queues configured. The queue configuration
does not align beautifully with other information. The queue section of
each port has been moved to the end of each port panel.

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