Adding support to named parameters in Router

We are now copying without blush to Django URL dispatcher
Adapted to new cluster configuration interface
Bootstraping cluster is now even more nice

* Stored cluster conf in Redis
* Unit test cluster configuration method
Fix unit test name
Added Leave Cluster action

* Is this action a requirement to do in save change process?
* Plus later action to save
Include basic support to free-format Template models

To be included in Composite
Template models are now visible out of composites
Added Template model called ClusterMetadata

To show cluster metadata and Leave Cluster button
Added cluster image for ClusterMetadata Template model
Merge branch 'ejhernandez/ha-base-multi-node' into jacalvo/ha-confrepl

Conflicts:
	main/core/ChangeLog