Trivial fixes

Signed-off-by: Robert Varga <robert.varga@pantheon.sk>
Be more explicit about state compression

This updates the PCUpd/PCRpt handling text to be very explicit about
what is allowed (not processing some PCUpds if there is a newer in
the queue) and what is not (removing already-generated PCRpts).

Signed-off-by: Robert Varga <robert.varga@pantheon.sk>