eds: Batch up emissions of personas-changed while starting up
eds: Batch up emissions of personas-changed while starting up

There’s no point in emitting personas-changed multiple times before the EDS
persona store has reached quiescence — it just means the individual
aggregator has to re-link more personas with each emission.

This patch batches up emissions of personas-changed from the EDS persona
store until is-quiescent is reached, then notifies about all personas in
a single emission.

pwithnall/folks,pwithnall/folks,renatofilho/folks2,GNOME/folks,GNOME/folks,pwithnall/folks,renatofilho/folks2,renatofilho/folks,renatofilho/folks,renatofilho/folks,renatofilho/folks,GNOME/folks,renatofilho/folks2,renatofilho/folks2