Stage nodes are rendered outside the stage in the workflow graph

[sagar1312]

What happened:
Node (Job) of a stage in the workflow graph is rendered outside the stage container. This give a false impression that the node does not belong to the stage.

What you expected to happen:
All the nodes of a stage should be enclosed within the the stage container irrespective of the position of other stages.

How to reproduce it:
Sample pipeline:
https://cd.screwdriver.cd/pipelines/14504