Fix up tests

crates/lb/tests/net.lua

@@ -90,7 +90,7 @@ describe("tcp", function()
       spawn(function()
         assert(not pcall(client.read, client, 1)) -- this should fail, since the first task is still reading
       end):await()
-      server:shutdown()
+      server:close()
       reader:await()
     end)
 
@@ -104,7 +104,7 @@ describe("tcp", function()
       spawn(function()
         client:write("hello") -- should be able to write while the first task is reading
       end):await()
-      server:shutdown()
+      server:close()
       reader:await()
     end)
 
@@ -123,9 +123,7 @@ describe("tcp", function()
         assert(server:write("ping") == true)
       end
       sleep(100)
-      server:shutdown()
-      server = nil
-      collectgarbage()
+      server:close()
       reader:await()
     end)
 
@@ -144,9 +142,7 @@ describe("tcp", function()
         assert(server:read(4) == "pong")
       end
       sleep(100)
-      server:shutdown()
-      server = nil
-      collectgarbage()
+      server:close()
       writer:await()
     end)
   end)
@@ -180,9 +176,9 @@ describe("tcp", function()
       local buf = client_stream:read(5)
       assert(buf ~= nil and #buf == 5)
       assert(buf == "hello")
-      -- shutdown
-      server_stream:shutdown()
-      client_stream:shutdown()
+      -- close
+      server_stream:close()
+      client_stream:close()
     end)
   end)
 end)