Aws-parallelcluster-node

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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).

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

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**BUG FIXES**
- Slurm: fix issue that prevented powering-up nodes to be correctly reset after a stop and start of the cluster.

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

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**ENHANCEMENTS**
- SGE: always use shortname as hostname filter with `qstat`. This will make nodewatcher more robust when using custom DHCP option, where the full hostname seen by `SGE` might differ from the hostname returned from EC2 metadata(local-hostname).
- Transition from IMDSv1 to IMDSv2.
- Have `computemgtd` reuse last available daemon configuration when the new one cannot be loaded.
- Use methods with timeouts to read NFS shared files, which will prevent `computemgtd` from hanging when NFS filesystems are not available.

**BUG FIXES**
- Fix a bug that caused `clustermgtd` to not immediately replace instances with failed status check that are in replacement process.

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