UTI: Set the time period for news to 180 days

- It is defined by the constant TIME_PERIOD, so it is the same as
  for the trending.
- The jumpavg lib is now much faster so we can use full scale for news.

Change-Id: Id092efa544e4ee2111564e09fb71fb6c3b48a73b
Signed-off-by: Tibor Frank <tifrank@cisco.com>