Fix bug: data can be stale when the local-repository is deleted.

Fix bug: data can be stale when the local-repository is deleted.

The data remained the same until an RRDP server had a delta update; in such case the updated files weren't found and the snapshot was processed, so the local cache was built again. In case that the RRDP server didn't had updates, the root manifest wasn't found and the whole validation cycle results were discarded.

Now, when the manifest isn't found and the RRDP has no updates, force the snapshot processing to assure that the error isn't of the RP. Also, update the daemon that cleans up the RRDP visited URIs, so that it deletes the files from its corresponding workspace.