If 'HTTP_X_AMZ_ACL' is present in environ when creating the bucket,
handle_acl_header in acl.py is called always.
In the case of the above delete 'HTTP_X_AMZ_ACL' from environ,
and header for s3_acl(x-container-sysmeta-swift3-acl) becomes
impossible to create.
Change-Id: Ic3f260e7f35c55029a59c1dd90869ceee17cf909
Closes-Bug: #1405510