Restrict rootwrap find filter for IBM NAS and GPFS

Additional make the name of the filter unique, so it does not override
any other rule. Like the find rule of the NetAppNFS driver.
Rootwrap is making use of plain python ConfigParser which handles INI files
with key=value pair like fashion. Where the key is unique.

Related-Bug: 1250101

Change-Id: I56a96084dc736e73e3e9533803f65956699891a0