LU-476 Run run-llog.sh on MGS in sanity 60a

LU-476 Run run-llog.sh on MGS in sanity 60a

sanity 60a had been effectively skipped during lab testing, in which the
MGS is not running on the host where sanity.sh is executed.  This patch
fixes the subtest by requesting run-llog.sh to be run on the MGS
explicitly.

Change-Id: I9dc47d856cd42bfe0cd5b5b71e3fd7d4f7c0e561
Signed-off-by: Li Wei <liwei@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1050
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>