ML Ops workshop missing steps

[gvashishtha]

We need to modify the instructions for ML Ops:

1. the azure-pipelines.yml has to be updated. The default arguments for the following parameters need to be changed to correspond to the workspace and workspace connection being used.

 mlWorkspaceConnection: 'build-demo' ,
  mlWorkspaceName: 'build-2019-demo',
  resourceGroupName: 'scottgu-all-hands'

2. aml_config/train.runconfig needs to be updated so that "target" is the name of the training cluster.

[CESARDELATORRE]

WORKSHOP-TODO