Upstream submission of some universal openSUSE patches

Summary:

• setup_mta: fix for not writing to amavisd.conf
• setup_roundcube: skins reside in rcpath/skins
• setup_mysql: mysql.service in openSUSE
• setup_mta: amavis.service and clamd.service in openSUSE
• setup_imap: cyrus.service in openSUSE
• setup_roundcube: apache2.service also in openSUSE
• setup_syncroton: apache2.service also in openSUSE
• setup_roundcube: add "www" group

Fixes T849

Reviewers: PyKolab Developers, vanmeeuwen

Reviewed By: PyKolab Developers, vanmeeuwen

Maniphest Tasks: T849

Differential Revision: https://git.kolab.org/D70