[FIXED JENKINS-21720] Improved config confirmation.

Ask for confirmation when navigating away from node, global,
security, view and log configuration after changes.

Don't require confirmation when pressing keys without changing
(e.g. pressing Tab for navigation) and when pressing Advanced
buttons.

Don't require confirmation when submitting the form.
[JENKINS-21720] Added User, Run, ComputerSet, and LabelAtom
[FIXED JENKINS-20597] Only ask when user can change
Merge pull request #1175 from daniel-beck/JENKINS-21720-2

[FIXED JENKINS-20597 JENKINS-21720] Improved config confirmation.
Noting #1175