Remove --controller

This add too much complexity and it can work
without it.

Fix https://github.com/GNS3/gns3-vm/issues/80, #645

gns3server/web/route.py

@@ -184,9 +184,6 @@ class Route(object):
                         return response
 
                     # API call
-                    if "controller" in func.__module__ and server_config.getboolean("controller", False) is False:
-                        raise aiohttp.web.HTTPForbidden(text="The server is not a controller")
-
                     request = yield from parse_request(request, input_schema, raw)
                     record_file = server_config.get("record")
                     if record_file:

gns3server/web/web_server.py

@@ -102,8 +102,7 @@ class WebServer:
             yield from self._handler.finish_connections()
             self._handler = None
 
-        if Config.instance().get_section_config("Server").getboolean("controller"):
-            yield from Controller.instance().stop()
+        yield from Controller.instance().stop()
 
         for module in MODULES:
             log.debug("Unloading module {}".format(module.__name__))
@@ -306,8 +305,7 @@ class WebServer:
         self._signal_handling()
         self._exit_handling()
 
-        if server_config.getboolean("controller"):
-            controller_start = asyncio.async(Controller.instance().start())
+        controller_start = asyncio.async(Controller.instance().start())
 
         if server_config.getboolean("shell"):
             asyncio.async(self.start_shell())