Revert "Create a new event loop for different stats collectors"
Revert "Create a new event loop for different stats collectors"

This reverts commit af169c43cda1c00206a24a0827af61bbef773485.

Change-Id: I39f60bbd254134f6fb918cc46bda99538ef12860
Reviewed-on: http://review.couchbase.org/89201
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

pavel-paulau/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner