* Refactor tests out of module for certbot-dns-cloudflare
* Refactor tests out of module for certbot-dns-cloudxns
* Refactor tests out of module for certbot-dns-digitalocean
* Refactor tests out of module for certbot-dns-dnsimple
* Refactor tests out of module for certbot-dns-dnsmadeeasy
* Refactor tests out of module for certbot-dns-gehirn
* Refactor tests out of module for certbot-dns-google
* Refactor tests out of module for certbot-dns-linode
* Refactor tests out of module for certbot-dns-luadns
* Refactor tests out of module for certbot-dns-nsone
* Refactor tests out of module for certbot-dns-ovh
* Refactor tests out of module for certbot-dns-rfc2136
* Refactor tests out of module for certbot-dns-sakuracloud
* Refactor tests out of module for certbot-dns-route53
* Move certbot-dns-google testdata/ under tests/
* Use pytest for dns plugins
* Exclude pycache and .py[cod]
Implement an Authenticator which can fulfill a dns-01 challenge using the OVH DNS API. Applicable only for domains using OVH DNS.
Testing Done:
* `tox -e py27`
* `tox -e lint`
* Manual testing:
* Used `certbot certonly --dns-ovh -d`, specifying a credentials file as a command line argument. Verified that a certificate was successfully obtained without user interaction.
* Used `certbot certonly --dns-ovh -d`, without specifying a credentials file as a command line argument. Verified that the user was prompted and that a certificate was successfully obtained.
* Used `certbot certonly -d`. Verified that the user was prompted for a credentials file after selecting dnsimple interactively and that a certificate was successfully obtained.
* Used `certbot renew --force-renewal`. Verified that certificates
were renewed without user interaction.
* Negative testing:
* Path to non-existent credentials file.
* Credentials file with unsafe permissions (644).
* Path to credentials file with an invalid application key.
* Path to credentials file with an invalid application secret.
* Path to credentials file with an invalid consumer key.
* Path to credentials file with missing properties.
* Domain name not registered to OVH account.
