Off-by-one error in max redirects with redirection enabled

There is a problem in the current stable version 6.1.1 where the setting proxy.config.http.number_of_redirections = 1 is incorrectly checked when following origin redirects by setting proxy.config.http.redirection_enabled = 1.

If the requested URL is not already cached, ATS returns the redirect response to the client instead of storing the target into the cache and returning it to the client.

The problem can be fixed by using proxy.config.http.number_of_redirections = 2, but we are only following one redirect, so this is wrong.