1.modify if statement due to arguments default settings change in argparser 2.support multi-level script output folder
add generate random script
Fix runner import issue and support generate script with no any args

argparser: add default value for config
gen_randomsc: add default device name and support generate with no any args
runner: modify import DeviceOperator module
add long tap command and fix runner read config issue
restore working folder after generate finished
Merge pull request #8 from MikeLien/local-dev

Fix gen_randomsc bugs and add generate script to runner