Review esp caching

Recently a cache was added to esp services so that if the same request is submitted, the results are retrieved from a memcached cache.  However this can be very confusing if the user explicitly refreshes the display.

The example I hit was I had a list of the workunits in eclwatch.  I submitted a workunit, and then clicked refresh so I could select it.  Nothing changed.  I then clicked it several times assuming it was a timing issue, refreshed the entire page, it still returned the same list.  Only after a relatively long period (30s?) did it appear in the list.

I think the cached semantics make a lot of sense, but if the user explicitly refreshes a page esp should allow the results to be recalculated (and update the cache...)

gordonsmith afishbeck wangkx