Consider no longer calling routerlist_remove_old_routers() from check_descriptor_callback()

2237     /* Remove dead routers. */
2238     /* XXXX This doesn't belong here, but it was here in the pre-
2239      * XXXX refactoring code. */
2240     routerlist_remove_old_routers();
2241   }

We should see if there's better place to call this function from.

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