daemon: Reduce pro-active exchange of routing data if PRoPHET routing is active

Prior to this patch, the PRoPHET routing implementation exchanges routing data with all
neighbors in a configurable interval. This pro-active behavior is removed now and replaces
through a reactive approach. Every time more recent PRoPHET routing data is necessary,
the routing module will trigger the handshake.
Merge pull request #68 from morgenroth/Disable-proactive-routing-handshake-using-PRoPHET

daemon: Reduce pro-active exchange of routing data if PRoPHET routing is active