[tests] nettoyage des db de test

tests/conftest.py

 
     yield
 
+    os.unlink(tmpdb)
+
 
 @pytest.fixture(scope="module")
 def set_db_values():
     db_file = "./db/prod-b827ebbcab83-20201206.db"
     shutil.copy(db_file, tmpdb)
     config['heatpump']['database'] = tmpdb
+
     yield
+    os.unlink(tmpdb)
 
 
 @pytest.fixture