
Clean up GetRunnerWaitStats to increase speed and decrease number of RPCs called.

R=mad
DELTA=14 (5 added, 2 deleted, 7 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6592


git-svn-id: 6f200aab33a7b6704a2e38529f84eef50a04cb11@442 722f4569-f0a1-f026-5e06-c3648ed4afc7

pombreda/swarming,pombreda/swarming,luci/luci-py,luci/luci-py,madecoste/swarming,madecoste/swarming,pombreda/swarming,madecoste/swarming,luci/luci-py,madecoste/swarming,pombreda/swarming,luci/luci-py