Remove Req from the Websocket interface

After the switch to Websocket, we are no longer in a request/response
scenario, therefore a lot of the cowboy_req functions do not apply
anymore.

Any data required from the request will need to be taken from Req
in init/2 and saved in the handler's state.

test/ws_SUITE_data/ws_echo_timer.erl

@@ -3,26 +3,26 @@
 -module(ws_echo_timer).
 
 -export([init/2]).
--export([websocket_init/2]).
--export([websocket_handle/3]).
--export([websocket_info/3]).
+-export([websocket_init/1]).
+-export([websocket_handle/2]).
+-export([websocket_info/2]).
 
 init(Req, _) ->
 	{cowboy_websocket, Req, undefined}.
 
-websocket_init(Req, State) ->
+websocket_init(State) ->
 	erlang:start_timer(1000, self(), <<"websocket_init">>),
-	{ok, Req, State}.
+	{ok, State}.
 
-websocket_handle({text, Data}, Req, State) ->
-	{reply, {text, Data}, Req, State};
-websocket_handle({binary, Data}, Req, State) ->
-	{reply, {binary, Data}, Req, State};
-websocket_handle(_Frame, Req, State) ->
-	{ok, Req, State}.
+websocket_handle({text, Data}, State) ->
+	{reply, {text, Data}, State};
+websocket_handle({binary, Data}, State) ->
+	{reply, {binary, Data}, State};
+websocket_handle(_Frame, State) ->
+	{ok, State}.
 
-websocket_info({timeout, _Ref, Msg}, Req, State) ->
+websocket_info({timeout, _Ref, Msg}, State) ->
 	erlang:start_timer(1000, self(), <<"websocket_handle">>),
-	{reply, {text, Msg}, Req, State};
-websocket_info(_Info, Req, State) ->
-	{ok, Req, State}.
+	{reply, {text, Msg}, State};
+websocket_info(_Info, State) ->
+	{ok, State}.