Make roles header test work regardless of order.

Something appears to have changed in the OpenResty v1.11.2.3 upgrade
that internally changed the order of the tables we use for keeping track
of the user's roles. However, we should have never been relying on the
table order, so fix the test so it works regardless of output order.

test/proxy/request_rewriting/test_adds_roles_header.rb

@@ -38,7 +38,12 @@ def test_comma_delimits_multiple_roles
     }))
     assert_response_code(200, response)
     data = MultiJson.load(response.body)
-    assert_equal("private,foo,bar", data["headers"]["x-api-roles"])
+    assert(data["headers"]["x-api-roles"])
+    assert_equal([
+      "bar",
+      "foo",
+      "private",
+    ].sort, data["headers"]["x-api-roles"].split(",").sort)
   end
 
   def test_strips_forged_values