Handler /execute/graphs don't work.

[Mikhail Samoylov]

Scenario:
            1. Setup master node
            2. Create env with 3 controller nodes and 1 compute+cinder node
            3. Upload two simple graphs
            4. Execute graphs
            5. Check that graph tasks was executed and
             finished without any errors

Actual result:
Step 4 failed with error:
http://paste.openstack.org/show/564841/
Expected result:
Test passed

[Dmitry Pyzhov (dpyzhov)]

Please provide Fuel version.

[Mikhail Samoylov (msamoylov)]

Invalid because the reason of failed it was incorrect update process to 9.1