- re-added missing pre- and post(un)install scripts to server subpackage
- added config file /etc/my.cnf to the file list (just for completeness)
- make sure to create the datadir with 755 permissions


support-files/mysql.spec.sh:
  - re-added missing pre- and post(un)install scripts to server subpackage
  - added config file /etc/my.cnf to the file list (just for completeness)
  - make sure to create the datadir with 755 permissions