LU-2131 tests: sanity using ost0 instead of ost1

In sanity test 81a,81b and the jobstat function are testing
against ost0 which technically don't exist. The test
framework starts the OSTs with ost1. This patch has the test
use the proper ost1.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: Ibb7e647b8d6a736ca930e9294aacf584c9c49880
Reviewed-on: http://review.whamcloud.com/4232
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>