As a user I want to choose from DLAB UI what version of Spark cluster can be deployed on notebook, so that I am not connected only with one version of Spark cluster.
- in drop down list for spark cluster on create computational resources popup there are more than one spark cluster for choice
- user can deploy different version of Spark cluster on one notebook
***Currently we support only 1 version of spark cluster
Github issue: https://github.com/apache/incubator-dlab/issues/744