gossip_cyclon: performance tweak for startup
gossip_cyclon: performance tweak for startup

Avoids a 'discard_msg' in the select_data() of the first node, thereby
providing a faster startup of gossip_cyclon.
tectronics/scalaris,tectronics/scalaris,tectronics/scalaris,seyyed/scalaris,tectronics/scalaris,digshock/scalaris,seyyed/scalaris,seyyed/scalaris,tectronics/scalaris,digshock/scalaris,seyyed/scalaris,seyyed/scalaris,tectronics/scalaris,digshock/scalaris,digshock/scalaris,digshock/scalaris,digshock/scalaris,digshock/scalaris,tectronics/scalaris,seyyed/scalaris,seyyed/scalaris