This patch ensures that the published_out output parameter is set to the
current consensus cache entry's "valid after" field.
See: https://bugs.torproject.org/22702
These still won't do anything till I get the values to be filled in.
Also, I changed the API a little (with corresponding changes in
directory.c) to match things that it's easier to store.
Initial tests. These just try adding a few consensuses, looking
them up, and making sure that consensus diffs are generated in a
more or less reasonable-looking way. It's enough for 87% coverage,
but it leaves out a lot of functionality.
This module's job is to remember old consensus documents, to
calculate their diffs on demand, and to .
There are some incomplete points in this code; I've marked them with
"XXXX". I intend to fix them in separate commits, since I believe
doing it in separate commits will make the branch easier to review.
