Log Message:
py-{acme,certbot}: Update to 0.27.0.

## 0.27.0 - 2018-09-05

### Added

- The Apache plugin now accepts the parameter --apache-ctl which can
  be used to configure the path to the Apache control script.

### Changed

- When using `acme.client.ClientV2` (or
 `acme.client.BackwardsCompatibleClientV2` with an ACME server that
 supports a newer version of the ACME protocol), an
 `acme.errors.ConflictError` will be raised if you try to create
 an ACME account with a key that has already been used. Previously,
 a JSON parsing error was raised in this scenario when using the
 library with Let's Encrypt's ACMEv2 endpoint.

### Fixed

- When Apache is not installed, Certbot's Apache plugin no longer
  prints messages about being unable to find apachectl to the
  terminal when the plugin is not selected.
- If you're using the Apache plugin with the --apache-vhost-root flag
  set to a directory containing a disabled virtual host for the
  domain you're requesting a certificate for, the virtual host will
  now be temporarily enabled if necessary to pass the HTTP challenge.
- The documentation for the Certbot package can now be built using
  Sphinx 1.6+.
- You can now call `query_registration` without having to first call
  `new_account` on `acme.client.ClientV2` objects.
- The requirement of `setuptools>=1.0` has been removed from
  `certbot-dns-ovh`.
- Names in certbot-dns-sakuracloud's tests have been updated to refer
  to Sakura Cloud rather than NS1 whose plugin certbot-dns-sakuracloud
  was based on.

## 0.26.1 - 2018-07-17

### Fixed

- Fix a bug that was triggered when users who had previously manually
  set `--server` to get ACMEv2 certs tried to renew ACMEv1 certs.