Incorrect timeout calculation for Heat stack create

[Mikhail Chernik]

Rally terminated thread with time-out after 10 sec waiting while 90 sec was configured, scenario HeatStacks.create_and_delete_stack

2016-01-26 00:31:15.812 3729 INFO rally.task.runner [-] Task c93d84ad-b26f-48d7-a90d-372d8f1b6d58 | ITER: 10 START

...

2016-01-26 00:31:27.082 3729 INFO rally.common.utils [-] Thread 140180428814080 is timed out. Terminating.
2016-01-26 00:31:27.759 3729 INFO rally.task.runner [-] Task c93d84ad-b26f-48d7-a90d-372d8f1b6d58 | ITER: 10 END: Error GetResourceFailure: Failed to get the resource <Stack {... u'stack_name': u's_rally_c93d84ad_PhWCIHrj', ... u'stack_status_reason': u'Stack CREATE started', u'creation_time': u'2016-01-26T00:31:17' ... , u'timeout_mins': None, ... , u'updated_time': None, u'id': u'1eaf843b-86f8-4363-8b43-ae5266acd054'... }>: Iteration interrupted due to timeout.

Rally task: http://paste.openstack.org/show/485668/
Rally log (filtered by process id): http://paste.openstack.org/show/485666/
Rally log (filtered by stack id): http://paste.openstack.org/show/485667/
Heat log - no errors: http://paste.openstack.org/show/485665/

developer@fuel:stack$ rally --version
0.2.0