Bug/stackopshead 498

Task's state and get task by node improved …

Has been improve the CLI to have into account
the node level at the moment to get a task and
perform a delete operation over it, also has been
updated the task's state to get due to the change
made in the API.

Bug: STACKOPHEAD-497

Task 'cancel' ans 'state' improved at node level …

Has been modified the RESTful requests for
'cancel' and 'state' in automation therefore must be
updated the client. Related with pull request
StackOps/stackops-head#23

Bug: STACKOPHEAD-498