optimize complete=false query

- This query is run from the home page
- This query runs at each master stop/disappear

Its very easy to optimize

Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>
simplify the doc

Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>
Merge pull request #1449 from tardyp/complete_optim

optimize complete=false query