* ingela/raimo/udp-send-TOS/ERIERL-294/OTP-15747:
  Introduce udp send ancillary data argument down to inet_drv
  Fix old warnings

* raimo/incomplete-socket-close/ERIERL-353/OTP-15370:
  Copy linger zero flag from listen socket
  Test linger zero flag from listen socket

* sverker/seq-trace-label-old-heap-bug/ERL-700/OTP-15849/OTP-15858/OTP-15859:
  erts: Fix faulty spec for seq_trace:set_token/2
  erts: Fix seq_trace:print/2 for arbitrary labels
  erts: Fix bug in seq_trace:set_token(label,_)

Would raise badarg if Label was not atom or small integer.

If internal seq-trace tuple is on old heap
an incorrect ref from old to new heap was made.

* siri/logger/file-logging-improvements:
  [logger] Add option file_check to logger_std_h
  [logger] Add log file rotation by options to logger_std_h
  [logger] Add better control of file modes in logger_std_h
  [logger] Refactor logger_std_h
  [logger] Make sure log file is re-opened with configured file options

OTP-15663

This option indicates how often the handler shall check if the log
file still exists and if the inode is changed.