Changes for automatic lockdown of experiments:
1. First off, we no longer do automatic lockdown of experiments when granting an extension longer then 10 days. 2. Instead, we will lockdown experiments on case by case basis. 3. Changes to the lockdown path that ask the reservation system at the target cluster if locking down would throw the reservation system into chaos. If so, return a refused error and give admin the choice to override. When we do override, send email to local tbops informing that the reservation system is in chaos state.
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