Added the get-vanilla-ut8-query and post-vanilla-query-space tests from the current official Signature Version 4 Test Suite (http://docs.aws.amazon.com/general/latest/gr/signature-v4-test-suite.html); note this brings the test suite up to date, except that I've excluded the incomplete get-header-value-multiline.req test, and the serverely-broken post-vanilla-query-nonunreserved test.