Zabbix

...G...... [ZBX-20448] improved error message when failed to accept incoming connection

Merge in ZBX/zabbix from feature/ZBX-20448-5.0 to release/5.0

* commit 'd984d5ce4c1daf3261df6626a60d46d585510844':
  .D........ [ZBX-20448] added ChangeLog entry
  ...G...... [ZBX-20448] improved error message when failed to accept incoming connection
  ...G...... [ZBX-20448] improved error message when failed to accept incoming connection
  ...G...... [ZBX-20448] fixed unhelpful log message for server listener in Zabbix agent 2

(cherry picked from commit 93bd050bf48fc2a967dd2d0b46b4b587e7cfa8a6)
(cherry picked from commit 5727123b68f49ce74c21606e5f0cd7b02c2d5baf)
(cherry picked from commit 4f4f782c9db00fea5f5fd71ff2888d18cce6a0ef)