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.
* Added DNS based authenticator plugin for Linode
* Added linode plugin to docs
* Added Dockerfile
* Added .gitignore and readthedocs.org.requirements.txt
* Updated default_propagation_seconds
* Updated according to changes requested
* Bump version to 0.26.0
* Advertise our packages work on Python 3.7.
Add port/package URL for py-acme
Use Freshports URL's instead of SVNWeb (repository) links as they provide (binary) package installation installation as well as further port/package information such as vulnerabilities, revision history and bug reports for each port respectively.
Correct tagging format.
Add request for random offsets for renewal.
Make all bulleted lists consistent.
Remove obsolete `letsencrypt` package for Fedora.
Remove discouraged letshelp-certbot package.
