sp: refreshDomainLinks before convertDomain

Domain conversion requires the links to be present.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=948346
Change-Id: If5d2481235bb54119be864a4a6bbb220718ade55
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/13633
Reviewed-by: Ayal Baron <abaron@redhat.com>