[LU-6900] improve parallel-scale-nfs suite

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.10.0
• Affects Version/s: Lustre 2.7.0

Epic/Theme

patch

• Severity: 3

Epic

test

• Assignee: Jian Yu
• Reporter: Elena Gryaznova

Description

parallel-scale-nfs suite has the following defects:

1. Suite deals only with nfs server exported from SINGLEMDS
(lustre_client) and nfs clients set to default CLIENTS list. No possibility to specify: NFS_SERVER, NFS_CLIENTS, nfs server's lustre mount point and mount points for nfs clients.

2. Suite does not cleanup the nfs setup properly in case
of failure, this breaks next tests.

3. Suite can not run on solo setup because it requires nfs
clients and nfs servers are to be the different nodes.
it fails with :

parallel-scale-nfsv3 : @@@@@@ FAIL: setup nfs failed!

Proposed patch fixes all listed defects.