* Make it dynamic by the domain given for the check.
* Change reporting text to be more clear about which is the dynamic
part (in lack of direct access to the path which was checked.)
* Implement testing if the provider-metadata.json is under
/.well-known/csaf/ available.
* Implement testing if the DNS is available and serves the
provider-metadata.json
* Remove minor typos.
* Go upper case for HTTPS as this is more common.
* Make texts indicating a good result start with somethink else
than "No", this removes an indirection in thinking and also offers
a visible difference.
* Bump copyright year to 2022.
* Do PGP to "public OpenPGP keys" while at the reporters.go file
while at it (to make merging easier).
* Use an explicit message to indicate that a check is not done because
of a missing implementation.
