(see also #4037)

Some odd behaviour spotted when reloading workflows.

Start off with a regular workflow and a few job submissions:

Then reload the workflow and old jobs disappear from the data store:

Now trigger the task again, the oldest job still in the store goes from failed to submit-failed, stranger still all subsequent jobs start as submit-failed, then go through running to failed:

See also #4036

[scheduler]
    initial cycle point = 1
    cycling mode = integer
    [[graph]]
        R1 = foo => bar
[runtime]
    [[foo,bar]]
        script = false

Pull requests welcome!
This is an Open Source project - please consider contributing a bug fix
yourself (please read CONTRIBUTING.md before starting any work though).