Before, postgres configuration was hardcoded. This worked OK for OCA's CI infrastructure, but failed in any other out there that had different defaults.
There's no need to hardcode it; Odoo already must have Postgres connection settings, so let's use those instead. This will make tests testable across different CI infrastructures.
* Heavily refactor code for reusability
* Split all sources into independent modules
* Add more test coverage
* Add CRUD methods
* Add iterator execute return to roadmap
* 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
