[releng] Remove maintainer tools

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9fc0643774631e00b67df4fd251c72ac9bca3e81
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Wed Apr 1 10:21:41 2020 -0500

    Remove maintainer tools
    
    These are still python2, and I assume nobody is using them. If anyone
    wants to resurrect them, feel free, but you need to port to python3.
    
    See: #12

 tools/maintainer/AUTHORS       |    1 -
 tools/maintainer/CONTRIBUTORS  |    2 -
 tools/maintainer/ChangeLog     |   82 ---
 tools/maintainer/Makefile      |   12 -
 tools/maintainer/README        |   13 -
 tools/maintainer/announcer.py  |  200 -------
 tools/maintainer/maintainer.py | 1165 ----------------------------------------
 7 files changed, 1475 deletions(-)