CLOUDIFY-2523 improve ruote process observer and handle workflow cancellation
Merge branch 'develop' into feature/CLOUDIFY-2523-terminate-workflow-task-failure

Conflicts:
	orchestrator/src/main/resources/cloudify/workflows/install.radial
	workflow-service/ruote/ruote_workflow_engine.rb
CLOUDIFY-2523 merge
CLOUDIFY-2523 flake8 + reverted test
CLOUDIFY-2523 fixed assertion in test
Merge pull request #153 from CloudifySource/feature/CLOUDIFY-2523-terminate-workflow-task-failure

Feature/cloudify 2523 terminate workflow task failure