rpm: automatically load the fuse module on EL5

The fuse module needs to be loaded before /dev/fuse can be used. On
RHEL6 and Fedora the module is loaded on demand. RHEL5 needs to load the
module manually.

This change add a script under /etc/sysconfig/modules/ that loads the
fuse module on boot and packages it in the EL5 version of
glusterfs-fuse.

One of the features of GlusterFS is to not depend on additional fuse
userspace. The conditional requires on /usr/bin/fusermount is not
needed, this command is never called in the current version (even though
is it referenced in the sources).

BUG: 947830
Change-Id: I166327b8f2dff2c150368bdf5ea917af259186b2
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/5102
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>