LU-691 Fix OST index errors in test suite - sanity 133c defect

LU-691 Fix OST index errors in test suite - sanity 133c defect

Several test run do_facet ost which assumes ost is ost0 which does not exist
according to the way the test suite works. This patch address several areas
where the wrong ost index is used. This patch also introduces some short hand
functions to get OST properties from the index. Those functions ensure ost1,
ost10 and ost100 are seen as different which is not always the case.

Change-Id: Ic31224794563964a3415d24abeebce9dacceb686
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/1425
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>