Refactor verbose code bits introducing task.LoopingCall helper.
Sort results of conflicts.get_application_status() to always give the
most recent entry on top of the list.
Teach banana serializer to serialize bound method of agents and
function types.

This breaks the compatibility with non-feat banana serializer, but
it removes the pain of passing those types as parameters to side
effect functions from the agent calls.
Make integrity agent monitor the state of configured replications and
raise/resolve alerts about its state.