Add implementation of SDL in python

Added implementation for the SDL API functions:
* Functions to set, get and remove synchronously key-values from
  SDL storage.
* Functions to set, get and remove synchronously group members from
  SDL storage.
* Functions to acquire, manipulate and release a lock.

Added also simple examples how to use SDL API functions.

Added configuration file for the tox tool to run unittests.

Added configuration file for the tox tool to generate documents.

Added sonar pom and tox hooks to verify code coverage.

Change-Id: I1f12879f725d903397ee8f9e788edf7890db381d
Signed-off-by: Timo Tietavainen <timo.tietavainen@nokia.com>
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
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+..
+..  Copyright (c) 2019 AT&T Intellectual Property.
+..  Copyright (c) 2019 Nokia.
+..
+..  Licensed under the Creative Commons Attribution 4.0 International
+..  Public License (the "License"); you may not use this file except
+..  in compliance with the License. You may obtain a copy of the License at
+..
+..    https://creativecommons.org/licenses/by/4.0/
+..
+..  Unless required by applicable law or agreed to in writing, documentation
+..  distributed under the License is distributed on an "AS IS" BASIS,
+..  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+..
+..  See the License for the specific language governing permissions and
+..  limitations under the License.
+..
+
+
+Release-Notes
+=============
+
+
+This document provides the release notes for release 1.0.0 of ricsdl.
+
+.. contents::
+   :depth: 3
+   :local:
+
+
+Version history
+---------------
+
++--------------------+--------------------+--------------------+--------------------+
+| **Date**           | **Ver.**           | **Author**         | **Comment**        |
+|                    |                    |                    |                    |
++--------------------+--------------------+--------------------+--------------------+
+| 2019-12-05         | 1.0.0              | T Tietavainen      | First version      |
+|                    |                    |                    |                    |
++--------------------+--------------------+--------------------+--------------------+
+
+
+Summary
+-------
+
+This is the first version of this package.
+It implements RIC Shared Data Layer (SDL) library.
+
+
+
+
+Release Data
+------------
+This is the first version of this package.
+
+
+
+
+
+Feature Additions
+^^^^^^^^^^^^^^^^^
+
+
+Bug Corrections
+^^^^^^^^^^^^^^^
+
+
+Deliverables
+^^^^^^^^^^^^
+
+Software Deliverables
++++++++++++++++++++++
+
+This version provides Python package ricsdl.
+It can be retrieved from pypi.org.
+
+
+
+Documentation Deliverables
+++++++++++++++++++++++++++
+
+
+
+
+
+Known Limitations, Issues and Workarounds
+-----------------------------------------
+
+System Limitations
+^^^^^^^^^^^^^^^^^^
+
+
+
+Known Issues
+^^^^^^^^^^^^
+
+Workarounds
+^^^^^^^^^^^
+
+
+
+
+
+References
+----------
+
+