[IMP] base_external_dbsource: Refactor & Split by source

* Heavily refactor code for reusability
* Split all sources into independent modules
* Add more test coverage
* Add CRUD methods
* Add iterator execute return to roadmap

[UPD] Update base_external_dbsource_mssql.pot

base_external_dbsource_mssql/__manifest__.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+# Copyright <2011> <Daniel Reis, Maxime Chambreuil, Savoir-faire Linux>
+# Copyright 2016 LasLabs Inc.
+# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl).
+{
+    'name': 'External Database Source - MSSQL',
+    'version': '10.0.1.0.0',
+    'category': 'Tools',
+    'author': "Daniel Reis, "
+              "LasLabs, "
+              "Odoo Community Association (OCA)",
+    'website': 'https://github.com/OCA/server-tools',
+    'license': 'LGPL-3',
+    'depends': [
+        'base_external_dbsource_sqlite',
+    ],
+    # Uncomment this for v11
+    # 'external_dependencies': [
+    #     'python': [
+    #         'sqlalchemy',
+    #         'pymssql',
+    #     ]
+    # ],
+    'demo': [
+        'demo/base_external_dbsource.xml',
+    ],
+    'installable': True,
+    'auto_install': True,  # Remove this key for v11
+}