add CTR test

tests/aes-ctr.json

@@ -0,0 +1,10 @@
+{
+    "server":"127.0.0.1",
+    "server_port":8388,
+    "local_port":1081,
+    "password":"aes_password",
+    "timeout":60,
+    "method":"aes-256-ctr",
+    "local_address":"127.0.0.1",
+    "fast_open":false
+}