remove os.system usage
remove os.system usage

Azure/azure-linux-extensions,bpramod/azure-linux-extensions,Azure/azure-linux-extensions,Azure/azure-linux-extensions,Azure/azure-linux-extensions,vityagi/azure-linux-extensions,bpramod/azure-linux-extensions,bpramod/azure-linux-extensions,Azure/azure-linux-extensions,bpramod/azure-linux-extensions,bpramod/azure-linux-extensions,Azure/azure-linux-extensions,vityagi/azure-linux-extensions,vityagi/azure-linux-extensions,vityagi/azure-linux-extensions,vityagi/azure-linux-extensions,Azure/azure-linux-extensions,bpramod/azure-linux-extensions,vityagi/azure-linux-extensions,bpramod/azure-linux-extensions,vityagi/azure-linux-extensions