OSM platform resiliency to single component failure

Change-Id: I281c3faa344071b77352c2c6643f61f589a4b81c
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

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+# OSM platform resiliency to single component failure #
+
+## Proposer ##
+- Gerardo Garcia (Telefonica)
+- Alfonso Tierno (Telefonica)
+- Francisco Javier Ramon (Telefonica)
+
+## Type ##
+**Feature**
+
+## Target MDG/TF ##
+SO, RO, VCA, UI
+
+## Description ##
+**This feature obsoletes feature #666: 
+https://osm.etsi.org/gerrit/#/c/666/**
+
+The NFV Orchestrator becomes a critical component for the operator in a 
+production environment. As such, it should be capable of recovering from 
+unexpected failures of its components, via a combination of techniques. In this 
+case, it should be possible to keep the system alive in case of failure of a 
+single component (e.g. active-standby redundancy).
+
+As part of this resilience strategy it might be useful identifying:
+- Which sub-components (inside each of the current modules) are intended to 
+store permanent information (databases, repositories) or should be considered 
+stateful, and devise specific HA strategies for them.
+- Which sub-components are stateless (or can recover efficiently their state 
+from databases or stateful components) and devise bootstrap and, if applicable, 
+load balancing or active-standby strategies for them.
+
+## Demo or definition of done ##
+In a running OSM system with an instantiated NS, an abrupt poweroff is forced 
+in the container where one OSM component is running. After that event, the OSM 
+system keeps working and can continue the operation of the running NS. This 
+process should fire an alarm. This abrupt power-off might potentially affect 
+any OSM component.