nfs-utils: nfs-iostat.py autofs cleanup and option to sort by ops/s

Conforms Python path to the LSB 3.2+ standard of /usr/bin/python
http://refspecs.freestandards.org/LSB_3.2.0/LSB-Languages/LSB-Languages/pylocation.html
Per SteveD this is also required for proper rpm dep resolution during
builds

Signed-off-by: Lans Carstensen <Lans.Carstensen@dreamworks.com>
Signed-off-by: Steve Dickson <steved@redhat.com>