Fix X-AMZ-ACL header is not applied

Current swift generates wrong ACL header (e.g. HTTP_HTTP_Container-Read)
because it is based on old swift3 specification to apply the header to
an "enviroment" variable of eventlet. However, now we use the header property
of swift3.request.Request (also swift.common.swob.Request) which doesn't need "HTTP"
prefix for a given property key.

Change-Id: Ie62468ad144772537610adb359c75f46d460fc64
Closes-Bug: 1381548
Merge "Fix X-AMZ-ACL header is not applied"