* mkdir for Ubuntu 12.04 precise

 * just copy for squeeze/
 * fetch only RUNNING containers

 * pickup active container with lxc-info
 * change internal name with clean_fieldname
 * fetch only RUNNING containers

 * same as 8222632
 * fetch only RUNNING containers

 * same as 8222632
 * fix permission
 * add explanation for configuration

 * these plugins need to be executed with root privilege
change label format

 * container name first, and then item name
 change data type to avoid graph spike

 * change type 'COUNTER' to 'DERIVE'
 * force minimum to '0'
 * monitoring traffic of lxc containers

 * only for veth device
 * need to set "lxc.network.veth.pair" each container
 * fix data source for negative and cdef attribute
 * shorten legends of graph
check that the entry is a directory before using it as such

Assuming everything under /var/lib/lxc/ is a directory and
then accessing it as such will fail at least on Debian wheezy,
since it contains /var/lib/lxc/template.config which is a file.
 * check config file existence instead of directory
Merge remote branch 'mittyorz/master'