Add integration tests (actions with workbooks)

This commit is first in the series of commits implementing
appropriate blueprint (please, look at link below).
In this commit I added a bunch of integration tests which check
work with workbooks(creation, updating, addition of definition and so on)
and use only python-mistralclient methods.

Targets blueprint: mistral-mistralclient-integration-tests

Change-Id: Ieb95929102cc7a27ceb6caf5d63f7417d07d3974