[WIP] Modify the typo in order to deploy the correct configuration file.

```
 # deploy the configuration file for processing /var/log/apt/history.log
-cookbook_file "/etc/td-agent/conf.d/processor_dstat.conf" do
-  source "processor_dstat.conf"
+cookbook_file "/etc/td-agent/conf.d/processor_aptitude.conf" do
+  source "processor_aptitude.conf"
```
Modify the typo in order to deploy the correct configuration file.

In order to deploy the configuration file for processing `aptitude` log file,
fix the following typo:

```
 # deploy the configuration file for processing /var/log/apt/history.log
-cookbook_file "/etc/td-agent/conf.d/processor_dstat.conf" do
-  source "processor_dstat.conf"
+cookbook_file "/etc/td-agent/conf.d/processor_aptitude.conf" do
+  source "processor_aptitude.conf"

   owner "root"
   group "root"
```
Merge pull request #120 from kazu634/fix-fluentd-custom

Modify the typo in order to deploy the correct configuration file.