fix(citest): Add queueing to gate Hystrix config (#2985)
fix(citest): Add queueing to gate Hystrix config (#2985)

A number of the intermittent failures observed in running our CI tests
are due to Gate returing a 500 on /tasks/task_id because Hystrix did not
have an available thread to use to query Orca.  As this is primarily a
problem with requests being bursty rather than an overall throughput
problem, adding a modest queue to the Hystrix config so that Gate can
handle and recover from short bursts of queries.
ewiseblatt/spinnaker,skim1420/spinnaker,ewiseblatt/spinnaker,duftler/spinnaker,spinnaker/spinnaker,skim1420/spinnaker,ewiseblatt/spinnaker,duftler/spinnaker,duftler/spinnaker,spinnaker/spinnaker,skim1420/spinnaker,duftler/spinnaker,spinnaker/spinnaker,skim1420/spinnaker,ewiseblatt/spinnaker,spinnaker/spinnaker