Aws-parallelcluster-node

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

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**ENHANCEMENTS**
- Improve error handling in slurm plugin processes when clustermgtd is down.

**CHANGES**
- Increase max attempts when retrying on Route53 API call failures.

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**ENHANCEMENTS**
- Add new `all_or_nothing_batch` configuration parameter for `slurm_resume` script. When `True`, `slurm_resume` will
succeed only if all the instances required by all the pending jobs in Slurm will be available.

**CHANGES**
- CentOS 6 is no longer supported.
- Optimize retrieval of nodes info from Slurm scheduler.
- Improve retrieval of instance type info by using `DescribeInstanceType` API.
- Increase timeout from 10 to 30 seconds when `clustermgtd` and `computemgtd` daemons invoke Slurm commands.

**BUG FIXES**
- Retrieve the right number of compute instance slots when instance type is updated.
- Fix a bug that was causing `clustermgtd` and `computemgtd` sleep interval to be incorrectly computed when
system timezone is not set to UTC.

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

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**ENHANCEMENTS**
- Add support for multiple queues and multiple instance types feature with the Slurm scheduler.
- Replace the previously available scaling components with: `clustermgtd` daemon that
takes care of handling compute fleet management operations, included the processing of health check failures coming
from EC2 and cluster start/stop operations; `slurm_resume` and `slurm_suspend` scripts that integrate with Slurm
power saving plugin; `computemgtd` daemon that monitors the health of the system from the compute nodes.
- Replace Auto Scaling Group with plain EC2 APIs when provisioning cluster nodes.
- Register cluster nodes in a Route53 private hosted zone when DNS resolution is enabled for the cluster.
- Register mapping between Slurm node names and EC2 instances in DynamoDB table.
- Create log files for the new components in `/var/log/parallelcluster/` dir.

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