Go back to timestamp-based identifiers for now
Go back from using UUIDs for request IDs and file names to using ad-hoc
timestamp-based values, since we still don't place hard requirements on
the libraries that we'd use for generating those UUIDs, which means we
could compile and fail to save any data to files.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>