Aws-parallelcluster-node

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**CHANGES**
- There were no changes for this version.

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**ENHANCEMENTS**
- Add possibility to override EC2 RunInstances parameters for instances launched in a Slurm cluster.

**CHANGES**
- Update Slurm plugin to support version 21.08.

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**CHANGES**
- There were no changes for this version.

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**CHANGES**
- There were no changes for this version.

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**CHANGES**
- There were no changes for this version.

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**ENHANCEMENTS**
- Implement scaling protection mechanism with Slurm scheduler: compute fleet is automatically set to 'PROTECTED' state
in case recurrent failures are encountered when provisioning nodes.
- Implement `computemgtd` self-termination via `shutdown` command instead of calling TerminateInstances.

**CHANGES**
- Drop support for SGE and Torque schedulers.
- Use tags prefix `parallelcluster:` when describing EC2 instances.
- Run Slurm command `scontrol` with sudo because clustermgtd is executed as cluster admin user (not root).