Store routing_keys in a dict instead of set
Store routing_keys in a dict instead of set

This will let us keep track of which react script uses what routing
key. We will lose the set property, but that is immaterial because
the system will be in trouble anyway, if there are duplicate keys

Change-Id: I89299fcb7dfbe7ab4d7b2d1df9c1cb001489fd5f

stackforge/entropy,stackforge/entropy,stackforge/entropy