Renamed the packetbeat-topology index with '.packetbeat-topology'.
Renamed the packetbeat-topology index with '.packetbeat-topology'.

This is to avoid the default packetbeat-* mapping to be applied to
the topology index. It is also making it more clear that it is a
meta index, like '.kibana'. Issue discovered in #107.

yapdns/yapdnsbeat,yapdns/yapdnsbeat