KIALI-2638 Add Handlers and Instances to IstioConfig #965
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** Describe the change **
Update adapters/templates code to support old CRD way to install/configure adapters (with one CRD per item) or new way with generic "adapter"/"template"/"handler"/"instances" way.
Note, that Istio 1.1 maintains old way, in Istio 1.2 the old CRD will be removed and that will highly simplify the logic as no need to fetch specific CRD code.
** Issue reference **
https://issues.jboss.org/browse/KIALI-2638
** Backwards incompatible? **
Yes, this modifies clusterrole.yaml as usual an it needs updates in upstream and downstream.
cc @gbaufake @jmazzitelli
Note, this is a preliminar step towards 3scale integration, so now Kiali can proper list and edit external adapters code: