After connecting, socket can send before connected. remove block connect api

examples/globallog.lua

@@ -1,5 +1,21 @@
 local skynet = require "skynet"
 
+skynet.register_protocol {
+	name = "text",
+	id = skynet.PTYPE_TEXT,
+	pack = function (...)
+		local n = select ("#" , ...)
+		if n == 0 then
+			return ""
+		elseif n == 1 then
+			return tostring(...)
+		else
+			return table.concat({...}," ")
+		end
+	end,
+	unpack = skynet.tostring
+}
+
 skynet.start(function()
 	skynet.dispatch("text", function(session, address, text)
 		print("[GLOBALLOG]", skynet.address(address),text)