do not install twisted >= 13.2.0

the twistd.daemonize API has silently changed in 13.2.0.
for now workaround this by forbidding to install anything
newer than 13.2.0.

Signed-off-by: Peter Lieven <pl@kamp.de>
supress tables exists warning with mysql at startup

Signed-off-by: Peter Lieven <pl@kamp.de>