Rename `icingaweb2::config' to `icingaweb2::config::general'

refs #6842
Profile `icingaweb2_dev': add `path' for Exec

refs #6842
Module `apache': add user `apache'

refs #6842
icingaweb2::config::general: require module `apache'

refs #6842
Profile `icingaweb2_dev': require module `apache'

refs #6842