LU-9892 test: fix SuSe nfsserver setup

LU-9892 test: fix SuSe nfsserver setup

Checking for SuSE-release and use nfsserver
Add export info to a /etc/exports

Test-Parameters: trivial testlist=parallel-scale-nfsv4 clientdistro=sles12sp3

Lustre-change: https://review.whamcloud.com/#/c/30476/
Lustre-commit: 9f07081fd9f57bd6bd52a8c26d28a477a0c20cfb

Change-Id: Id12370ae35d878e51bdf6f71a77b1b82b5e82c33
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/30809
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>