This was spotted by Debian's lintian tool. It adds an informational
warning at every run, so my OCD was kicking in and I had to fix it :-)
Closes#17787
Some feature names used in tests had minor differences compared to
the well-known ones from `curl -V`. This patch syncs them to make test
results easier to grok.
Closes#14183
1956 adds the sha256 value corresponding to an empty buffer
1957 adds an arbitrary value and confirms that the signature differs from 1956
1958 adds whitespace to 1957 and confirms that the signature matches 1957
1959 adds a value longer than 'char sha_hex[65]' in Curl_output_aws_sigv4()
Signed-off-by: Casey Bodley <cbodley@redhat.com>
Closes#9804
