- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING
checksrc is updated to allow non-year using copyright statements
Closes#10205
Handle canonical headers and signed headers creation as explained here:
https://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
The algo tells that signed and canonical must contain at last host and
x-amz-date.
So we check whatever thoses are present in the curl http headers list.
If they are, we use the one enter by curl user, otherwise we generate
them. then we to lower, and remove space from each http headers plus
host and x-amz-date, then sort them all by alphabetical order.
This patch also fix a bug with host header, which was ignoring the port.
Closes#7966
