Remember which manifests where fetched using RRDP, remove rrdp_handler.

Remember which manifests where fetched using RRDP, remove rrdp_handler.

+Remember all manifests URIs that were processed from a snapshot or delta file, this will aid to avoid unnecessary rsync's on child CAs.
+Create 'visited_uris' struct and methods to remember URIs from RRDP snapshot/delta file(s). This should be updated to use another struct more efficient than an SLIST.
+Remove 'rrdp_handler' and do its calls directly where needed.
+Add warning message whenever an access method fails and the secondary access method is utilized.
+Assure that RRDP Update Notification URIs are visited only once per validation run.
+In case there's a manifest error, don't retry the repository download if the accessMethod to get the manifest was RRDP.