Merge branch 'jk/http-redact-fix'

Sensitive data in the HTTP trace were supposed to be redacted, but
we failed to do so in HTTP/2 requests.

* jk/http-redact-fix:
  http: match headers case-insensitively when redacting

diff --cc http.c
Simple merge

diff --cc t/t5551-http-fetch-smart.sh
Simple merge