Modify test so generated ciphers are in the expected order

(cherry picked from commit 93164c6)

Author: lukebakken

test/config_schema_SUITE_data/rabbit.snippets

@@ -326,15 +326,15 @@ tcp_listen_options.exit_on_close = false",
         {ssl_options,
             [{cacertfile,"test/config_schema_SUITE_data/certs/cacert.pem"},
              {ciphers, [
-               "DHE-RSA-AES256-GCM-SHA384",
+               "ECDHE-ECDSA-AES256-GCM-SHA384",
+               "ECDHE-RSA-AES256-GCM-SHA384",
+               "ECDHE-ECDSA-AES256-SHA384",
+               "ECDHE-RSA-AES256-SHA384",
                "ECDH-ECDSA-AES256-GCM-SHA384",
-               "ECDH-ECDSA-AES256-SHA384",
                "ECDH-RSA-AES256-GCM-SHA384",
+               "ECDH-ECDSA-AES256-SHA384",
                "ECDH-RSA-AES256-SHA384",
-               "ECDHE-ECDSA-AES256-GCM-SHA384",
-               "ECDHE-ECDSA-AES256-SHA384",
-               "ECDHE-RSA-AES256-GCM-SHA384",
-               "ECDHE-RSA-AES256-SHA384"
+               "DHE-RSA-AES256-GCM-SHA384"
              ]},
              {certfile,"test/config_schema_SUITE_data/certs/cert.pem"},
              {keyfile,"test/config_schema_SUITE_data/certs/key.pem"},