This patch adds an ability to rerun failed workflow by
skipping failed tasks. Workflow behavior in skip case could
be configured by new fields in task definition:
* on-skip
* publish-on-skip
Change-Id: Ib802a1b54e69c29b4d0361f048c2b9c076a4c176
Implements: blueprint mistral-task-skipping-feature
Signed-off-by: Oleg Ovcharuk <vgvoleg@gmail.com>