Release RC_U · DataBiosphere/leonardo

We are releasing RC_U to FireCloud production on 2018-07-10.

This release includes the following Leo issues:
RC_U_2018-07-10

#417: 404 when trying to localize to new clusters in Leo
- User facing: this allows installing JupyterLab on Leo-created clusters. To do so, specify the following userJupyterExtensionConfig in the createCluster request:
```
"userJupyterExtensionConfig": {
 "nbExtensions": {},
 "serverExtensions": {"jupyterlab": "jupyterlab"},
 "combinedExtensions": {}
}
```
Once the cluster is created, JupyterLab can be accessed by appending /lab to the notebooks URL. For example: https://notebooks.firecloud.org/notebooks/project/cluster/lab.
#406: Fix Leo error handling for Dataproc not enabled
- User facing: Leo will now return a descriptive error message when trying to create a cluster in a project where Dataproc is not enabled. Previously, the user would be left in a bad state.
#158: Automation tests should execute in parallel
- Non-user facing: improves automated test execution time

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