*   Adding center bias option for boosted trees.
*   Add `synchronization` and `aggregation` args to get_variable(). These args
    will be used for distributed variables.
*   Add `synchronization` and `aggregation` args to the layer `add_weight()`
    API. These args will be used for distributed variables.
*   `tf.losses.*` do not add to the global collection when executing eagerly (to

 - Upgrade kubescheduler.config.k8s.io/v1alpha2 to kubescheduler.config.k8s.io/v1beta1
  
   - `.bindTimeoutSeconds` was moved as part of plugin args for `VolumeBinding`,
     which can be configured separately per profile.
   - `.extenders` are updated to satisfy API standards. In particular:
     - `.extenders` decoding is case sensitive. All fields are affected.