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.

Lustre-change: https://review.whamcloud.com/29786
Lustre-commit: 0b8e9558e88930814857c97dfe2394f8c8e24a9a

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-by: James Casper <jamesx.casper@intel.com>
Reviewed-by: Saurabh Tandan <saurabh.tandan@intel.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/30353
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>