netinfo.getIpInfo: handle slashless address

Apparently, 32 bit prefix is not reported within the address field.

Change-Id: I44f0658dd337f6930900985f227302f52c7add0d
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34137
Reviewed-by: Ondřej Svoboda <osvoboda@redhat.com>
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>