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Remove useless commit calls in JobRunner

Description

Remove useless commit calls in JobRunner

These were meant as sanity checks, but would fail in those
unusual cases anyway with exceptions. Instead, have an
early check to make sure no explicit transaction rounds
are active when JobRunner:run is called.

Change-Id: I723c77c8d3ef7ec4dcf09ce6d549b4fd57bdf1c2