fix: use correct spawn method in order to fix livesync
fix: use correct spawn method in order to fix livesync

`childProcess.spawn` is blocking method and waits for close event to resolve the promise. Actually we'll never received `close` event because we want to read log file all the time. So use `require("child_process").spawn` in order to fix livesync command.

telerik/ios-sim-portable,telerik/ios-sim-portable,telerik/ios-sim-portable