LU-845 tests: automate large LUN testing

LU-845 tests: automate large LUN testing

a. run llverdev on the raw device to verify there is no driver issue
b. run llverfs on OST ldiskfs filesystem
c. use up free inodes on the OST with mdsrate
d. run llverfs on lustre filesystem

Change-Id: I021009647d2053fa53cff1067f8f2bc83d12ce45
Signed-off-by: Wei Liu <sarah@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1700
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>