This recommended update for cyrus-imapd fixes the following issues:

- cyrus-imapd used another PID instead of what was defined, making it hard to stop or restart the server.
Also, it's daily cronjob failed, as the user 'cyrus' now defaults to the nologin shell.

* Changed cyrus-imapd-rc-2.tar.gz/cron.daily.cyrus to 'su -s /bin/bash - cyrus', as the default shell is now /sbin/nologin [boo#908014]
* Changed cyrus-imapd-rc-2.tar.gz/rc.cyrus to set /var/run/cyrus-master.pid as the PID file (was: /var/run/cyrus.pid) [boo#908006]