SD-404 : Write more behave tests, especially for error flows

Even after eve fix (https://github.com/nicolaiarocci/eve/pull/375)
something is not working well and test_request_context is still needed.
SD-404 : Write more behave tests, especially for error flows

Deleted the test request on celery and fixed the croping when read data
from request
Merge branch 'master' of https://github.com/ioanpocol/superdesk-server
SD-404 : Write more behave tests, especially for error flows
SD-514 : Ingest package don't fetch subitems and on ingest preview an error is showed

Fixed fetch ingest package issue, added a few e2e tests and changed the
match function from steps the do partial matching on lists.