feed bug fixes

- feed entry cache should take the protocol as part of the cache key
- in KalturaSyndicationFeedRenderer place the criterions directly on the
  criteria object instead of using a filter. in large feeds the filter
  created a criterion of status = 2 and status 2 and ... this happened
  because the even though the criteria is clone on every cycle, clone
  performs a shallow copy, the criterions are not cloned, and the filter
  is applied over and over on the same criterion.