packaging: setup: Update sysconfig/nfs contents

conf/nfs.sysconfig.in, which is used to update /etc/sysconfig/nfs,
sets variables that are no longer used in recent fedora nfs-utils
init scripts. This change sets instead variables that are used by
the init system of both new fedora and old fedora/rhel/centos.

Bug-Url: https://bugzilla.redhat.com/1011853
Change-Id: Ibc144c85a14e967c1994d35d36c3b3e16aa5ff77
Signed-off-by: Yedidyah Bar David <didi@redhat.com>