def _scp_file(self, source_file, dest_file, file_system):
return self._xfer_file(<EOL>source_file=source_file,<EOL>dest_file=dest_file,<EOL>file_system=file_system,<EOL>TransferClass=FileTransfer,<EOL>)<EOL>
SCP file to remote device.

Return (status, msg)
status = boolean
msg = details on what happened