Feature request: Centralized VCA for KNFs

Change-Id: I26e57b674c4482027595af1429379dc596c92776
Signed-off-by: David Garcia <david.garcia@canonical.com>

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+# Centralized VCA for KNFs #
+
+## Proposer ##
+- David García
+
+## Type ##
+**Feature**
+
+## Target MDG/TF ##
+N2VC, LCM (minimal changes)
+
+## Description ##
+
+Make the VCA aware of the added k8sclusters in OSM, rather than bootstrap juju controllers to the k8sclusters
+
+### Implementation
+
+Current workflow:
+
+1. NBI gets a request to add a k8s cluster (osmclient: `osm k8scluster-add`)
+2. LCM handles the request
+    2.1. Initializes helm-charm in the k8scluster
+    2.2. Initializes juju-bundle in the k8scluster
+        2.2.1. Use the k8s credentials to bootstrap a juju controller to the k8scluster
+        2.2.2. Store the juju controller credentials in mongodb
+
+Proposed workflow:
+
+1. NBI gets a request to add a k8s cluster (osmclient: `osm k8scluster-add`) (no change)
+2. LCM handles the request
+    2.1. Initializes helm-charm in the k8scluster (no change)
+    2.2. Initializes juju-bundle in the k8scluster
+        2.2.1. Use the k8s credentials to **add the k8s cluster as another cloud in the VCA**
+
+
+## Demo or definition of done ##
+
+This feature is considered complete when any k8scluster added to OSM is added as a cloud to the VCA, and the juju-bundles kdus are deployed to the k8scluster successfully.