Adding back the summary to the requirement document, but updated with

current Doctor status

Change-Id: Iba7f7f6ff97c4c651e8403a969739d3fced2aec0
Signed-off-by: Gerald Kunzmann <kunzmann@docomolab-euro.com>

diff --git a/docs/development/requirements/06-summary.rst b/docs/development/requirements/06-summary.rst
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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+Summary and conclusion
+======================
+
+The Doctor project aimed at detailing NFVI fault management and NFVI maintenance
+requirements. These are indispensable operations for an Operator, and extremely
+necessary to realize telco-grade high availability. High availability is a large
+topic; the objective of Doctor is not to realize a complete high availability
+architecture and implementation. Instead, Doctor limited itself to addressing
+the fault events in NFVI, and proposes enhancements necessary in VIM, e.g.
+OpenStack, to ensure VNFs availability in such fault events, taking a Telco VNFs
+application level management system into account.
+
+The Doctor project performed a robust analysis of the requirements from NFVI
+fault management and NFVI maintenance operation, concretely found out gaps in
+between such requirements and the current implementation of OpenStack.
+A detailed architecture and interface specification has been described in this
+document and work to realize Doctor features and fill out the identified gaps
+in upstream communities is in the final stages of development.