suite/run,schedule,result: write rerun memo as the first job in suite

suite/run,schedule,result: write rerun memo as the first job in suite

so we don't need to wait for the job to write result to for rerunning
the test suite. without this change, the "result" is normally the last
job in the suite to be scheduled, so it's likely we will not have the
results.log until the suite is almost completed. afer this change,
a "first-in-suite" job is scheduled as the first job to note down
the subset and seed to run the suite.

Signed-off-by: Kefu Chai <kchai@redhat.com>