Update Behat fixtures to use outline scenarios

Fix product Behat test to add identifier in variables
Merge pull request #256 from eko/behat

Update some Behat tests using scenarios outline
Merge pull request #255 from sylvaindeloux/2.3-develop

[WIP] Added product serializer config
Improve routing definition
SONATA-427 - Fix products final review templates + add login stepper

Remove stepper stylesheets

Fix user bundle login template to extends from base_login.html.twig
Merge pull request #252 from eko/2.3-develop

SONATA-427 - Fix products final review templates + add login stepper
Fixed wrong path in load_data
Merge pull request #262 from Bladrak/fixedLoadData

Fixed wrong path in load_data
Try to fix Behat test order.feature
Merge pull request #263 from eko/2.3-develop

Try to fix Behat test order.feature
Implemented product api
Fixed test configuration
Merge pull request #265 from Bladrak/fixTestConfig

Fixed test configuration
Reactivated admin regression test
Merge pull request #264 from Bladrak/productApi

Implemented product api
Merge pull request #267 from Mimiscita/reactivatingRegressionAdminTest

Reactivated admin regression test
SONATA-378 - Fixed default notification backend