include virt-preview repo for Fedora based builds

Note:  no repo for rawhide or EL6, so just Fedora and
Fedora Development branches

Change-Id: Ia6215e0cae99847e8288459ccd8e11bff88f4cc5
Signed-off-by: Mike Burns <mburns@redhat.com>
update release to 3.0.0-1

Notes:  keep 999 so that jenkins still populates datestamp info

3.0.0-1 was released on ovirt.org, so need to update the release
information

Change-Id: I7a67a80c288d033aa19c4a9577e8a79cfbdc6024
Signed-off-by: Mike Burns <mburns@redhat.com>