[MIG] base external dbsource

* Migration of base_external_dbsource to odoo 9.0

* Fixing test error

* Moving test from yaml to python

* Fixing pylint error in test class

* Placeholder added to connection string text zone

* improving test coverage

base_external_dbsource/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+   :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+   :alt: License: AGPL-3
+
+=========================
+External Database Sources
+=========================
+
+This module allows you to define connections to foreign databases using ODBC,
+Oracle Client or SQLAlchemy.
+
+Installation
+============
+
+No installation required.
+
+Configuration
+=============
+
+Database sources can be configured in Settings > Configuration -> Data sources.
+
+Depending on the database, you need:
+
+* to install unixodbc and python-pyodbc packages to use ODBC connections.
+* to install FreeTDS driver (tdsodbc package) and configure it through ODBC toconnect to Microsoft SQL Server.
+* to install and configure Oracle Instant Client and cx_Oracle python library to connect to Oracle.
+
+
+Usage
+=====
+
+To use this module:
+
+* Go to Settings > Database Structure > Database Sources
+* Click on Create to enter the following information:
+
+* Datasource name 
+* Pasword
+* Connector: Choose the database to which you want to connect
+* Connection string : Specify how to connect to database
+
+.. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
+   :alt: Try me on Runbot
+   :target: https://runbot.odoo-community.org/runbot/149/9.0 for server-tools
+
+Known issues / Roadmap
+======================
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/server-tools/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed feedback `here <https://github.com/OCA/
+server-tools/issues/new?body=module:%20
+base_external_dbsource%0Aversion:%20
+9.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Daniel Reis <dreis.pt@hotmail.com>
+* Maxime Chambreuil <maxime.chambreuil@savoirfairelinux.com>
+* Gervais Naoussi <gervaisnaoussi@gmail.com>
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit http://odoo-community.org.