(from AES) Merge pull request #1375 from datawire/nkrause/fix-acmeprovider-case-sensitivity
(from AES) Merge pull request #1375 from datawire/nkrause/fix-acmeprovider-case-sensitivity

Make acmeProvider.authority: none case insensitive
datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador