In SERVER-58466 we introduced an optimization on the lookup function of the CatalogCache to avoid building a new ChunkManager if this object is going to be the same than the one we had before. 

However, I forgot to also log a line stating that the refresh was completed. This log line is very useful for debugging purposes, so I propose to add it. The same applies for the update of the stats.

This fix will have to be backported to 6.0 but not to 5.0: the optimization was not backported to that version.