Commits on May 2, 2018

1. upstream: desynchronize WRR picks. …

   This PR fixes two issues:
   
   * Avoid having synchronized behavior across the fleet by having a seed
     applied to each WRR balancer instance.
   * Avoid having WRR reset to same host on each refresh, biasing towards
     earlier hosts in the schedule.
   
   Risk Level: Medium (there will be observable traffic effects due to
     changes in host pick schedule).
   Testing: New unit tests, modified existing.
   
   Signed-off-by: Harvey Tuch <htuch@google.com>

   

   htuch committed May 2, 2018
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2. Fix tests. …

   Signed-off-by: Harvey Tuch <htuch@google.com>

   

   htuch committed May 2, 2018
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3. Comment updates. …

   Signed-off-by: Harvey Tuch <htuch@google.com>

   

   htuch committed May 2, 2018
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4. Remove resumption for weighted, it's wrong and complicated to get rig… …

   …ht for now.
   
   Signed-off-by: Harvey Tuch <htuch@google.com>

   

   htuch committed May 2, 2018
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