Implement diagnose command to test flash SSD
A new diagnose command has been implemented to test the disk.
Syntax
diagnose disktest <option>
Option can be the following:
device Specify which device to test.
block The block size of each read/write operation.
time The limit of test time of each cycles. Default is no limit.
size The limit of test size of each cycles. Default is no limit.
run Run test with specified cycles. Default is infinite cycles.