[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/__init__.py

@@ -19,6 +19,4 @@
 #
 ##############################################################################
 
-from . import base_external_dbsource
-
-# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
+from . import models