Add rerunIterations

[smlambert]

Fixes #777

Retry running certain test jobs automatically if they fail (wasteful if applied to unstable jobs that do not have up-to-date exclusions and triage done against them).

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[steelhead31]

LGTM

[sxa]

Since this has been trialled with Semuru I'm going to assume this is safe so giving approval. A couple of notes:

1. How does TRSS handle the re-runs?
2. Since this is going to require regeneration for the new parameter it will presumably exacerbate "Skipped parameter" warnings in jenkins server log infrastructure#2774 in the short term until we get every job we have regenerated