[TEST] Behat upgrade test

Testing PRs:
* community: https://github.com/ezsystems/ezpublish-community/pull/181
* kernel: https://github.com/ezsystems/ezpublish-kernel/pull/981
* behatbundle: https://github.com/ezsystems/BehatBundle/pull/11
* demobundle: https://github.com/ezsystems/DemoBundle/pull/112
AFAICT behatbundle is missing in repositories and require ("dev-behat_upgrade")