tagomoris/fluent-mixin-config-placeholders — pull request #4 by kenjiskywalker (2014-01-24 11:46:48+00:00)
Title: hostname can set even if the 'hostname' is key

This pull-requst is variable name change `hostname` to `myhostname`.
If there is config key `hostname`, check placeholders(`${hostname}, %{hostname} or __HOSTNAME__`),
and set host name in value.

### before

```

type record_modifier
tag foo.filtered

gen_host ${hostname}
foo bar

```

### after

```

type record_modifier
tag foo.filtered

hostname ${hostname}
foo bar

```