From Kilo onwards the swift-proxy charm is misconfiguring the swift3 middleware such that the api is unable to respond to any requests. We fix this by providing working config for Kilo onwards. NOTE: see LP for full explanation but due to problems with package version mismatches in the UCA this patch only fixes Trusty Kilo, (L is EOL) and Xenial Mitaka. Change-Id: Ice5690e7f06ffc78dd20b53b67dffc6bd72b2613 Closes-Bug: 1738063