Vnstat2 - Integration of vnstat_php_frontend into packages repo from tar

Updated vnstat2 package version & maintainer in 8.xml and 8.xml.amd64
Integrated vnstat_php_frontend instead of linking tar on files.pfsense.org
Cleaned up uninstall and databases are still left intact at /cf/conf/vnstat
Encapsulated pkg directory except xmls
Misc indent changes

Tested on Pfsense 2.1 i386 on a fresh install throughut changes. don't think anything was changed that will inpact nanobsd or amd64