Use Freeswitch for mkdir (#3049)

This change reduces  the strain on the system by running the OS command through Freeswitch rather than directly from Lua. When running directly from Lua it causes RTP jitter in a high capacity system.

resources/install/scripts/resources/functions/mkdir.lua

@@ -1,6 +1,6 @@
-
 --add the mkdir function
         function mkdir(dir)
+                api = freeswitch.API();
                 dir = dir:gsub([[\]], "/");
                 if (package.config:sub(1,1) == "/") then
                         --unix
@@ -9,6 +9,7 @@
                         --windows
                         cmd = [[mkdir "]] .. dir .. [["]];
                 end
-		os.execute(cmd);
+                -- os.execute(cmd);
+                api:executeString("system " .. cmd  );
                 return cmd;
         end