Fix indentation in nfsserver.py

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Improve code formatting in nfsserver plug-in

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Fix nfsstat invocation in nfsserver plug-in

The '-a' option is an undocumented option to nfsstat that only
reports that ACL data is not yet implemented.

The options should be '-o all' to retrieve all available NFS
stats.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>