[YUNIKORN-1566] Handle leaf-parent conversion with running applications

[pbacsko]

What is this PR for?

Applying a new config for a queue should be an all-or-nothing operation: a failure must not leave the hierarchy in with inconsistent configuration.

What type of PR is it?

• [ ] - Bug Fix
• [x] - Improvement
• [x] - Feature
• [ ] - Documentation
• [ ] - Hot Fix
• [ ] - Refactoring

Todos

• [ ] - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-1566

How should this be tested?

Screenshots (if appropriate)

Questions:

• [ ] - The licenses files need update.
• [ ] - There is breaking changes for older versions.
• [ ] - It needs documentation.