LU-9872 tests: modify check space requirements for NFS test

LU-9872 tests: modify check space requirements for NFS test

In parallel-scale-nfs testing, the Lustre clients NFS mounts
the Lustre file system. In some cases, the file system looks
like it has enough space (du) to run NFS testing, but one or
more OSTs is full or is almost full. Since the default striping
for Lustre is a single stripe, some NFS tests will fail because
the file it is writing gets written to that almost full OST.

Increase the default stripe to all OSTs for all
parallel-scale-nfs tests.

Test-Parameters: trivial testlist=parallel-scale,parallel-scale-nfsv3,parallel-scale-nfsv4
Signed-off-by: James Nunez <james.a.nunez@intel.com>
Change-Id: Iff187dc6c158d9063cd36ced0801b88cdc8814ae
Reviewed-on: https://review.whamcloud.com/29786
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Casper <jamesx.casper@intel.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>