Add a rang: filter.

Signed-off-by: Min Chen <minchnew@gmail.com>
REST APIs for sFlow tab is done.

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

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

Signed-off-by: Min Chen <minchnew@gmail.com>
QoS can be CRUDed per port.

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

Signed-off-by: Lemon Li <lemon.li@pica8.local>
Signed-off-by: Min Chen <minchnew@gmail.com>
NetFlow Tab Done.

Signed-off-by: Min Chen <minchnew@gmail.com>
QoS, NetFlow and sFlow tabs are done.

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