Smart.pl more lax for mira machines. Firmware checking added.

Smart.pl now is a bit more lax when it comes to mira machines due
to them generally having shittier disks. Also changed so it detects
if the firmware on an areca machine is too old to check smart and
will error out of it is.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>