pytest plugins: use the standard 'no operation' syntax for hooks

tests/plugins/dblog.py

@@ -47,7 +47,7 @@ def db_write(plugin, writes, **kwargs):
 
         plugin.conn.execute("COMMIT;")
 
-    return True
+    return {"result": "continue"}
 
 
 plugin.add_option('dblog-file', None, 'The db file to create.')

tests/plugins/hold_invoice.py

@@ -11,7 +11,7 @@ plugin = Plugin()
 @plugin.hook('invoice_payment')
 def on_payment(payment, plugin, **kwargs):
     time.sleep(float(plugin.get_option('holdtime')))
-    return {}
+    return {'result': 'continue'}
 
 
 plugin.add_option('holdtime', '10', 'The time to hold invoice for.')

tests/plugins/reject_some_invoices.py

@@ -20,7 +20,7 @@ def on_payment(payment, plugin, **kwargs):
         WIRE_TEMPORARY_NODE_FAILURE = 0x2002
         return {'failure_code': WIRE_TEMPORARY_NODE_FAILURE}
 
-    return {}
+    return {'result': 'continue'}
 
 
 plugin.run()

tests/plugins/rpc_command.py

@@ -24,7 +24,7 @@ def on_rpc_command(plugin, rpc_command, **kwargs):
     elif request["method"] == "help":
         request["method"] = "autocleaninvoice"
         return {"replace": request}
-    return {"continue": True}
+    return {"result": "continue"}
 
 
 plugin.run()