Some renewals fail with message about missing webroot path

[dale-c-anderson]

Seen a few failures lately with messages that look like:

...
Select the webroot for domain.extample.com:
Choices: ['Enter a new webroot', '/var/www/letsencrypt']
(You can set this with the --webroot-path flag). Skipping.
...

Error is caused by one of the subject alternative names missing from the certbot renewal config file.

Would be nice to find out why they're not showing up, but adding --webroot-path /var/www/letsencrypt to the renewal command line is an easy workaround.