Update RPM spec file

Update the RPM file with the comments from submittal spec
file to the Fedora Project. This update also differntiates
between the project name 'gluster-swift' and the Fedora
distribution name 'glusterfs-openstack-swift'.  This simple
changes makes it less confusing when downloading the source
on http://launchpad.net/gluster-swift .

For more information on the Fedora Project submittal status
please see: https://bugzilla.redhat.com/show_bug.cgi?id=1003089

This fix also creates a tar.gz source file so that Jenkins
can archive it.  This can be used for distributions other
than RPM based systems.

Change-Id: Ia9b85d53cf576a7754aaa018396adb70cb0f2855
Signed-off-by: Luis Pabon <lpabon@redhat.com>
Reviewed-on: http://review.gluster.org/6261
Reviewed-by: Thiago Da Silva <thiago@redhat.com>
Tested-by: Thiago Da Silva <thiago@redhat.com>