Give the Redirect a HostName - filled in from the s3 bucket name.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5730 from SvenDowideit/fix-hostname-for-redirects

Give the Redirect a HostName - filled in from the s3 bucket name.