* raimo/receive-TOS-TCLASS/ERIERL-187/OTP-15145:
  Elaborate the disclaimer for 'pktoptions'
  Improve platform filter
  Fix endianness bug for CMSG parsing

* raimo/receive-TOS-TCLASS/ERIERL-187/OTP-15145:
  Write testcases for recvtos and friends
  Fix term buffer overflow bug
  Fix documentation due to feedback
  Implement socket option recvtos and friends

If the report callback function has two arguments, the second argument
is a map with options to limit the size of the log event. To even
allow a better formatting when the event shall be printed on a single
line, the new option single_line is now included in this
argument.

The encoding option was introduced in commit
270d909696a753af022df72a404c73f2895b4a02, to allow report callbacks to
format according to a given encoding. There was, however, no
connection between this encoding option, and the encoding of the
device to which the logger handler was writing.

Since a formatter is defined to return unicode:chardata(), and in
order to avoid mismatch with the encoding of the device, the encoding
option is now removed from the formatter. The handler itself must make
sure that it does not write illegal data to its device.

* maint-21:
  Updated OTP version
  Update release notes
  Update version numbers
  kernel: Fix missing abort_connection in net_kernel
  Prevent inconsistent node lists
  Fix an endless rescheduling loop when a process is executing process_info(self(), ...)