Runnable added after manager started skips leader election and may run twice

[abursavich]

If a runnable is added after the manager has started, the runnable is unconditionally started. In the case that the runnable should wait for leader election, it will start early (without leadership) and then it will be started again when the manager wins election.

#466 (comment)

[DirectXMan12]

/kind bug
/priority critical-urgent