py3: fix swift-account-audit
py3: fix swift-account-audit

Previously, we'd get a KeyError trying to read headers.

Change-Id: I5d9f86784a3e39577ab010d29d8d03b26ffda357

openstack/swift,openstack/swift,swiftstack/swift,tipabu/swift,openstack/swift,tipabu/swift,swiftstack/swift,openstack/swift,tipabu/swift,swiftstack/swift,tipabu/swift