[dovecot/core] cf7857: director: Support flush socket

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: cf7857bce68a33cdabe88bb15568e21921eb5ac7
      https://github.com/dovecot/core/commit/cf7857bce68a33cdabe88bb15568e21921eb5ac7
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2016-10-22 (Sat, 22 Oct 2016)

  Changed paths:
    M src/director/Makefile.am
    M src/director/director-settings.c
    M src/director/director-settings.h
    M src/director/director.c

  Log Message:
  -----------
  director: Support flush socket

This allows specifying an URI to execute
on user kill. It can be of form
exec:/path/to/bin, unix:/path/to/socket or
tcp:ip:port

The location is sent FLUSH username-hash
per killed user. You can execute some
action there, and you are expected to
return '+\nOK\n' as reply once you are
done.