Stop maintaining multiple copies of the same conf

[daipom]

Just refactoring. This does not change the result.

[daipom]

We need to do some fixes following this.
I will do them after this PR.

• Update the Fluentd config for Windows: msi: apply new package name to default config #527
• Update the following filepaths.
  • /opt/fluent/share/td-agent.conf.tmpl: Rename default config backup under /opt/ #528
    • I think the filename should be fluentd.conf.default.
  • /opt/fluent/share/td-agent-ruby.conf: Remove td-agent-ruby.conf #529
    • we should remove this file because it is not used since rpm: drop deprecated prelink configuration #472

I have one question.
Do we still need /opt/fluent/share/td-agent.conf.tmpl?

It is not used after the following PR:

• deb: remove needless update conf hook #344

but it is still better to have the default config under the /opt/fluent/share/, right?

[daipom]

Note: related fixes in the past:

• deb: remove needless update conf hook #344
• deb: update tmpl path #147
• rpm: fix W: non-conffile-in-etc #101
• Introduce generating configuration files from templates feature #3

[ashie]

but it is still better to have the default config under the /opt/fluent/share/, right?

I think so.

[daipom]

but it is still better to have the default config under the /opt/fluent/share/, right?

I think so.

Thanks!

[kenhys]

As the rest of the work will be done in another PR (#525 (comment)),
it seems a reasonable fix.

[daipom]

Thanks for your review!

[daipom]

Done all TODO!

#525 (comment)