Data processing templates tables refactoring

Remove 'data_processing.cluster_templates/_nodegroups_list.html'
and 'data_processing.nodegroup_templates/_processes_list.html'
templates and make corresponding lists at the Cluster Templates
and Node Group Templates tables using standard Column class
attributes.

Closes-Bug: #1356836

Change-Id: I82aa325ed27e06bd4652df7934488e67bd5e514b
Merge "Data processing templates tables refactoring"