g3proxy: default to use yaml conf file extension

g3proxy/examples/simple_tcp_stream/g3proxy.yaml

@@ -0,0 +1,33 @@
+---
+runtime:
+  thread_number: 2
+
+controller:
+  local:
+    recv_timeout: 30
+    send_timeout: 1
+
+server:
+  - name: test
+    escaper: default
+    type: tcp_stream
+    listen:
+      address: "[::1]:10086"
+    proxy_pass: "127.0.0.1:5201"
+    conn_limit: 100M
+
+resolver:
+  - name: default
+    type: c-ares
+    server: 223.5.5.5
+
+escaper:
+  - name: default
+    type: direct_fixed
+    bind_ip: "127.0.0.1"
+    resolver: default
+    tcp_conn_limit: 80M
+    egress_network_filter:
+      default: forbid
+      permit:
+        - 127.0.0.1