Delete openvpn cookbook.

- Do *NOT* install openvpn official cookbook.
- Do *NOT* install chef-solo-search library.
- Delete the OpenVPN handling rake task.
- Delete openvpn library path from .gitignore.

This commit refs #42.
Delete openvpn-wrapper cookbook.

- Delete openvpn-wrapper cookbook.
- Delete "recipe[openvpn-wrapper]" from README.md.

This commit refs #42.
Update `Gemfile.lock`.

This commit refs #42.
Merge pull request #42 from kazu634/id/42

OpenVPNのクックブックを削除する