Comment 7 for bug 1774238

Reviewed: https://review.openstack.org/571048
Committed: https://git.openstack.org/cgit/openstack/swift/commit/?id=9d0162a793115d55dd11c40b619657db41fa9968
Submitter: Zuul
Branch: master

commit 9d0162a793115d55dd11c40b619657db41fa9968
Author: Tim Burke <email address hidden>
Date: Tue May 29 16:37:42 2018 -0700

    Make ACLs work with Unicode in user/account names

    There were two separate complications:

      - Account ACLs are stored as JSON, so they were getting deserialized
        to Unicode. That's fine for ASCII names (as u'a' == b'a' under py2),
        but not arbitrary Unicode (as u'\u1234' != u'\u1234'.encode('utf8')
        for both py2 and py3). So, under py2, encode all account ACL members
        as UTF-8.

      - Container ACLs are stored as comma-separated values in a header, but
        values may contain arbitrary characters including not only non-ASCII
        Unicode but also commas and newlines. Fortunately, we have precedent
        for using URL-encoding in headers to resolve this. See crypto,
        symlink, dlo, versioned_writes, copy...

    Change-Id: I37a97bb9d039a963c7cc57bd97876d0ec2134cf1
    Partial-Bug: 1774238