Some MCU commands are used inefficiently

[mrnuke]

The following MCU commands take a list of ports:

• 10 - poe_cmd_port_detection_type()
• 11 - poe_cmd_port_classification()
• 13 - poe_cmd_port_disconnect_type()
• 15 - poe_cmd_port_power_limit_type()
• 16 - poe_cmd_port_power_budget()
• 1A - poe_set_port_priority()
• 1C - poe_set_port_power_up_mode()

realtek-poe is sending only one port per command. The issue is we're sending up to 192 config packets for a 24-switch port. That could drop to 66 by shoving more than one port per packet. I suspect this might help with #10 and #13.

Further optimizations

• poe_cmd_port_detection_type() and poe_cmd_port_disconnect_type() can also use 0x7f to signal all ports.
• The trace that I have for 1900 ZyXEL GS1900-24HPv1 doesn't make use of 00, 10, 11, or 13.

[mrnuke]

FIxed by #19