pkt4_send drop status should drop

Original report said: It says that SKIP means to not send when in fact it means to not pack. IMHO the comment was messed with the buffer4_send one at the last code reorg. BTW I did not look at the dev guide so I can't suggest a priority.

However, the proper solution is for the SKIP flag to skip packing and DROP flag to actually drop the packet.

Edited Jan 31, 2020 by Tomek Mrugalski

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