Use `upstart` service provider, when applying Ubuntu over precise.

When restart SSH daemon under Ubuntu (12.10, 13.04, 13.10, 14.04),
the restarting fails.

To work around this, use `upstart` service provider.

See: [[COOK-3910] Use Upstart provider for Ubuntu 13.10 by andreychernih · Pull Request #30 · opscode-cookbooks/openssh](https://github.com/opscode-cookbooks/openssh/pull/30)

This commit refs #84.
Merge pull request #84 from kazu634/id/84

[tahr] sshdの再起動に失敗する