Fix network connect and logging

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
Fix network connect and logging

Additional description (if needed):
For unblocking connect() select returns. This PR adds a getsockopt() check to detect eof/unsuccessful connect early, before attempting to read(). Also log messages were enhanced.

Test cases demonstrating functionality (if applicable):
Set an irc server that is unreachable and .set console +*
Before:

[05:42:20] Trying server 192.168.16.141:6667
[05:42:20] net: open_telnet_raw(): idx 4 host 192.168.16.141 ip 192.168.16.141 port 6667 ssl 0
[05:42:20] [!m] CAP LS 302
[05:42:20] [m->] CAP LS 302
[05:42:20] [!m] NICK BotA
[05:42:20] [m->] NICK BotA
[05:42:20] [!m] USER BotA . . :A deranged product of evil coders
[05:42:20] [m->] USER BotA . . :A deranged product of evil coders
[05:42:23] net: connect! sock 8
[05:42:23] Connected to 192.168.16.141
[05:42:23] [@] 
[05:42:23] net: eof!(read) socket 8
[05:42:23] Disconnected from 192.168.16.141

After:

[05:43:32] Trying server 192.168.16.141:6667
[05:43:32] net: open_telnet_raw(): idx 4 host 192.168.16.141 ip 192.168.16.141 port 6667 ssl 0
[05:43:32] [!m] CAP LS 302
[05:43:32] [m->] CAP LS 302
[05:43:32] [!m] NICK BotA
[05:43:32] [m->] NICK BotA
[05:43:32] [!m] USER BotA . . :A deranged product of evil coders
[05:43:32] [m->] USER BotA . . :A deranged product of evil coders
[05:43:35] net: connect! sock 8 error No route to host
[05:43:35] Disconnected from 192.168.16.141

[chatgpt-codex-connector]

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