Add LAG_TIME to throttle read/write frequency

If read/write operation is too frequently, sleep for LAG_TIME to slow
down. This can reduce CPU time and improve the effectiveness of each
read/write operation.

Signed-off-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Add a script to start remote console in raw mode

The remote console is based on socat pty raw mode.

Signed-off-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>