Name already in use

…3438..

…ixes dehydrated-io#850)

…E v1

…, but maybe by other CAs)

)

…ate chains (fixes dehydrated-io#845)

…feature

Signed-off-by: Simon Deziel <simon@sdeziel.info>

Current output of `uname` on Darwin/macOS 11 is only `Darwin`, which
breaks the premisse used in `command_version()`. This update adds
`Darwin` alongside `BSD`.

openssl.cnf may not end with a newline. The section [SAN] will then not be found as it is added to the last line of openssl.cnf.

letsencrypt is phasing out the v1 server:

```
  + ERROR: An error occurred while sending get-request to https://acme-staging.api.letsencrypt.org/directory (Status 403)

Details:
HTTP/2 403
server: nginx
date: Thu, 01 Apr 2021 20:48:17 GMT
content-type: application/problem+json
content-length: 189
etag: "600b3710-bd"

{
  "type": "urn:acme:error:serverInternal",
  "detail": "ACMEv1 Brownout in Progress. ACMEv1 will fully turn off on June 1, 2021. Check https://letsencrypt.status.io/ for more details."
}

```

…#816)

e.g. with different key algorithms

…o whitespace

- Ensure that all per-certificate settings are saved and restored in
  store_configvars() and reset_configvars() - that's what makes them
  per-certificate in the first place...

- Add OCSP_FETCH and OCSP_DAYS in the documented list of supported
  per-certificate configs, since the code does allow these.