Aws-parallelcluster-node

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**ENHANCEMENTS**
- Add support for EC2 Fleet as an alternative instance provisioning mechanism that allows greater flexibility in terms of instance diversification and launch strategy.

**CHANGES**
- Do not replace DRAIN nodes when nodes are in COMPLETING state as Epilog may be still running.
- Consider all dynamic nodes in IDLE+CLOUD+COMPLETING+POWER_DOWN+NOT_RESPONDING as unhealthy.

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

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**ENHANCEMENTS**
- Temporarily disable compute resource when a node launch fails due to insufficient capacity.
- Add support for rebooting compute nodes via Slurm.

**CHANGES**
- Drop support for python 3.6.
- Do not replace dynamic node in POWER_DOWN as jobs may be still running.
- Manage static nodes in POWERING_DOWN.
- Automatic disabling of the compute fleet when the configuration parameter `Scheduling/SlurmQueues/ComputeResources/SpotPrice`
is lower than the minimum required Spot request fulfillment price.

**BUG FIXES**
- Handle corner case in the scaling logic when instance is just launched and the describe instances API doesn't report yet all the EC2 info.
- Fix file handle leak in `computemgtd`.

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

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**BUG FIXES**
- Reset node address when setting slurm unhealthy static node to down to avoid treating static node failed with insufficient capacity as bootstrap failure node.

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