Implement reservation approval.
"reserve" will automatically approve sufficiently small reservation requests. Otherwise, it will make a note in the database but not actually hold any resources. Big reservation requests can be approved manually, with the "reserve -a" option (either at the time of the initial request, or subsequently with "reserve -a -m ..."). When a reservation request is feasible but not auto-approved, "reserve" will send e-mail to testbed-ops and exit with status 2.
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