Add collectd::plugin::zfs_arc
Support LogSendErrors on the write_graphite plugin

From
[collectd.conf(5)](http://collectd.org/documentation/manpages/collectd.conf.5.shtml#plugin_write_graphite):

```
LogSendErrors false|true

    If set to true (the default), logs errors when sending data to
    Graphite. If set to false, it will not log the errors. This is
    especially useful when using Protocol UDP since many times we want
    to use the "fire-and-forget" approach and logging errors fills
    syslog with unneeded messages.
```
Merge pull request #199 from ByteInternet/write_graphite_logsenderrors

Support LogSendErrors on the write_graphite plugin
Merge pull request #198 from ByteInternet/zfs_arc

Add collectd::plugin::zfs_arc
Add puppet-lint.rc
Lintian/style fixes