Changes:
* Don't use a separate dict for keeping track of sockets pending
accept and sockets pending connect; rely more on the semantic
meaning of the enum patty_ax25_sock_status values
* Ensure DISC frames are acknowledged by UA frames
* Ensure a receiving system only shuts down a connection after
receiving a UA frame in response to a sent DISC frame
* Ensure a sending system only shuts down a connection just prior to
sending a UA frame in response to a received DISC frame
* Don't use the P/F flag for the connection management U frames;
implicitly assume the P/F flag is set to 1, and always send frames
with a true P/F flag
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