This update for mailgraph fixes the following issues:

Fixed for break from last maintenance update (boo#1138214)

  * fix filling of empty sysconfig vars
    - MAILGRAPH_LOG_TYPE="syslog"
    - MAILGRAPH_LOG_FILE="/var/log/mail"
  * remove '-d' option from MAILGRAPH_OPTS
    - MAILGRAPH_OPTS=" -v"

- fix sysconfig file

  * for systemd there needs to be a [SPACE] before first option

- Removed ExecStop from service file, since it is not needed and
  systemd can keep track ot the process by itself. 
- Adjusted ExecStart in service file to use $MAILGRAPH_OPTS
  instead of ${MAILGRAPH_OPTS}, so that parameters are properly
  passed to mailgraph script.
- Removed "-d" from MAILGRAPH_OPTS in sysconfig file, since the
  script should not run in deamon mode by default, but rather
  should keep running continiously (in the foreground) so that
  systemd can properly track the status. This is something that
  might need to be re-adjusted on systems where this package is
  already installed.