certificate

• certbot/docs/install.rst points to certbot-auto uninstall instructions
• certbot/docs/uninstall.rst certbot-auto uninstall instructions
• certbot/docs/using.rst certbot-auto is mentioned as a deprecated installation method that people might need to change the command in response to

At some point, we should probably remove these, possibly depending on how our usage statistics look.

Describe the bug:

This will allow users to set up API mgmt for provisioners, and unblock users in environments where the ca.json is not easily accessible.

The --enable-admin flag would create the first provisioner and admin (this code already exists, just behind a boolean).
The --acme flag would create an ACME provisioner.

Related: smallstep/certificates#737

Beyonce said it best. If you like it then you shoulda put a test on it. Scenarios I like:

• Cert is created with right DN
• Cert is stored to X509Store after creation
• Cert request is not resubmitted
• Handles failures gracefully
• HTTP challenge/response works as expected
• Certificate renewal when cert is about to expiration