plugin: Make a common directory of plugins in contrib

No need to create a directory each.

Signed-off-by: Christian Decker <@cdecker>

contrib/helloworld-plugin/main.py

@@ -1,75 +0,0 @@
-#!/usr/bin/env python
-"""Simple plugin to show how to build new plugins for c-lightning
-
-It demonstrates how a plugin communicates with c-lightning, how it registers
-command line arguments that should be passed through and how it can register
-JSON-RPC commands. We communicate with the main daemon through STDIN and STDOUT,
-reading and writing JSON-RPC requests.
-
-"""
-import json
-import sys
-
-
-greeting = "World"
-
-
-def json_hello(request):
-    greeting = "Hello {}".format(request['params']['name'])
-    return greeting
-
-
-def json_init(request):
-    global greeting
-    return {
-        "options": [
-            {"name": "greeting",
-             "type": "string",
-             "default": greeting,
-             "description": "What name should I call you?"},
-        ],
-        "rpcmethods": [
-            {
-                "name": "hello",
-                "description": "Returns a personalized greeting for {name}",
-            },
-        ]
-    }
-
-
-def json_configure(request):
-    """The main daemon is telling us the relevant cli options
-    """
-    global greeting
-
-    greeting = request['params']['options']['greeting']
-    return "ok"
-
-
-def json_ping(request):
-    return "pong"
-
-
-methods = {
-    'hello': json_hello,
-    'init': json_init,
-    'ping': json_ping,
-    'configure': json_configure,
-}
-
-partial = ""
-for l in sys.stdin:
-    partial += l
-    try:
-        request = json.loads(partial)
-        result = {
-            "jsonrpc": "2.0",
-            "result": methods[request['method']](request),
-            "id": request['id']
-        }
-        json.dump(result, fp=sys.stdout)
-        sys.stdout.write('\n')
-        sys.stdout.flush()
-        partial = ""
-    except Exception:
-        pass

tests/test_plugin.py

@@ -8,7 +8,7 @@ def test_option_passthrough(node_factory):
 
     First attempts without the plugin and then with the plugin.
     """
-    plugin_path = 'contrib/helloworld-plugin/main.py'
+    plugin_path = 'contrib/plugins/helloworld.py'
 
     help_out = subprocess.check_output([
         'lightningd/lightningd',