Apache plugin: configure all matching domain names to be able to answer HTTP challenge. (#6729)

Attempts to configure all of the following VirtualHosts for answering the HTTP challenge:

* VirtualHosts that have the requested domain name in either `ServerName` or `ServerAlias` directive.
* VirtualHosts that have a wildcard name that would match the requested domain name.

This also applies to HTTPS VirtualHosts, making Apache plugin able to handle cases where HTTP redirection takes place in reverse proxy or similar, before reaching the Apache HTTPD.

Even though also HTTPS VirtualHosts are selected, Apache plugin tries to ensure that at least one of the selected VirtualHosts listens to HTTP-01 port (configured with `--http-01-port` CLI option). So in a case where only HTTPS VirtualHosts exist, but user wants to configure those, `--http-01-port` parameter needs to be set for the port configured to the HTTPS VirtualHost(s).

Fixes: #6730

* Select all matching VirtualHosts for HTTP-01 challenges instead of just one

* Finalize PR and add tests

* Changelog entry

1 files changed, 2 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 204b7b328..c529f3bb4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 
 * Lexicon-based DNS plugins are now fully compatible with Lexicon 3.x (support
   on 2.x branch is maintained).
+* Apache plugin now attempts to configure all VirtualHosts matching requested
+  domain name instead of only a single one when answering the HTTP-01 challenge.
 
 ### Fixed