- CertificateSigningRequest API conditions were updated:
  - a `status` field was added; this field defaults to `True`, and may only be set to `True` for `Approved`, `Denied`, and `Failed` conditions
  - a `lastTransitionTime` field was added
  - a `Failed` condition type was added to allow signers to indicate permanent failure; this condition can be added via the `certificatesigningrequests/status` subresource.

## Bug Fixes and Other Changes

*   `tfe.Network` is deprecated. Please inherit from `tf.keras.Model`.
*   Layered variable names have changed in the following conditions:
    *   Using `tf.keras.layers` with custom variable scopes.
    *   Using `tf.layers` in a subclassed `tf.keras.Model` class. See
        [here](https://www.tensorflow.org/versions/r1.9/api_docs/python/tf/layers)

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