FreeBSD uses wheel as gid 0
Ignore .sample files, they're sample from packages.

--- node/munin-node.conf.in.orig	2014-11-24 21:46:24 UTC
+++ node/munin-node.conf.in
@@ -10,7 +10,7 @@ background 1
 setsid 1
 
 user root
-group root
+group wheel
 
 # This is the timeout for the whole transaction.
 # Units are in sec. Default is 15 min
@@ -30,6 +30,7 @@ ignore_file %$
 ignore_file \.dpkg-(tmp|new|old|dist)$
 ignore_file \.rpm(save|new)$
 ignore_file \.pod$
+ignore_file \.sample$
 
 # Set this if the client doesn't report the correct hostname when
 # telnetting to localhost, port 4949