Fix GPFS KNFS allow/deny access so that it does not reuse
the ssh prefix when looping through NFS server commands for
allow and deny access.
This fixes GPFS KNFS allow/deny access incorrect behavior
when multiple NFS servers are configured (gpfs_nfs_server_list)
and any of the servers are remote (except the last one).
Change-Id: I8c182eed386e8325b087c3192d363502bb848633
Closes-Bug: #1651578