Implement ARC data collection on FreeBSD.
zfs_arc plugin: Add copyright information for Xin Li.
zfs_arc plugin: Use a buffer with fixed size rather than allocating on the heap.

The key length is very predicable, so buffer length is not a problem.
zfs_arc plugin: Fix indentation.
Merge branch 'xl/zfs'
Fix typo

recive -> receive
Merge branch 'feature-write_graphite-udp' of git://github.com/jjmaestro/collectd