Log new and terminating telnet connections only when debug flag is set

[yubiuser]

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5

PR #1370 changed the telnet API error handling. It also logs when new telnet connections were made. However, the web interface makes a lot of connections via the API, all of them get logged. This creates logspam.

This PR changes the behavior to only log if the debug flag is set.

[DL6ER]

It seems to be there already on master:

FTL/src/api/socket.c

Lines 505 to 506 in 37e6052

	if(config.debug & DEBUG_API)
	logg("Accepting new telnet connection at socket %d", csck);

[DL6ER]

Should also be here:

FTL/src/api/socket.c

Line 523 in 37e6052

logg("Terminating IPv4 telnet thread");

[yubiuser]

You did not link master but the current branch. On master

FTL/src/api/socket.c

Lines 504 to 505 in bc5077d

	logg("Accepting new telnet connection at socket %d", csck);

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Pushed fix for terminating