hotfix Workaround for DoctrinePHPCRBundle regression

Fixes issue with non-existing workspace creation: https://github.com/sulu-cmf/sulu-standard/issues/378

Workaround for regression in the DocintrePHPCRBundle: https://github.com/doctrine/DoctrinePHPCRBundle/issues/178

Note this can also be manually set:

````
# app/config/phpcr.yml
parameters:
    phpcr_backend:
        type: jackrabbit
        url: http://localhost:8080/server/
        check_login_on_server: false # << fixes the problem
    phpcr_workspace: defaultasda
    phpcr_user: admin
    phpcr_pass: admin
````