Slurm - account for nested accounts

[johrstrom]

The accounts API in slurm should account for nested accounts as they relate to partitions and their accessibly.

From discourse

https://discourse.openondemand.org/t/form-auto-queues-missing-a-partition/3958/6

Here's a partition that has a AllowAccounts value that's actually a parent account. Any AccountInfo that is a child of this account should be allowed in this queue.

PartitionName=sla-prio Nodes=basic_nodes,standard_nodes,himem_nodes TRESBillingWeights=CPU=0,Mem=0,GRES/gpu:a100=0,GRES/gpu:p100=0,GRES/gpu:v100=0,GRES/gpu:a100_3g=0,GRES/gpu:a100_1g=0,GRES/gpu=0 CpuBind=core DefaultTime=24:00:00 PriorityTier=100 ReqResv=YES AllowAccounts=reserved_allocation

I'm fairly sure we have to make another CLI call to accomplish this.