Munin contributed plugins

Whitespace cleanup

• remove trailing whitespace
• remove empty lines at the end of files

Category Tree: Reduce number of categories
ceph, samba, zfs into "fs"
apache into "webserver"
lighttpd into "webserver"
..

updated apache_vhost to actually work (at least on my debian squeeze machine..): Surrounded thaw by eval{} to suppress error at the very first run and escaped "." and "-" at the sanitizing regex in apache_pipelogger