Aws-parallelcluster-node

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

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**ENHANCEMENTS**
- Dynamically generate the architecture-specific portion of the path to the SGE binaries directory.

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**ENHANCEMENTS**
- `sqswatcher`: The daemon is now compatible with VPC Endpoints so that SQS messages can be passed without traversing
the public internet.

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**ENHANCEMENTS**
- Improved the management of SQS messages and retries to speed-up recovery times when failures occur.

**CHANGES**
- Do not launch a replacement for an unhealthy or unresponsive node until this is terminated. This makes cluster slower
at provisioning new nodes when failures occur but prevents any temporary over-scaling with respect to the expected
capacity.
- Increase parallelism when starting `slurmd` on compute nodes that join the cluster from 10 to 30.
- Reduce the verbosity of messages logged by the node daemons.
- Do not dump logs to `/home/logs` when nodewatcher encounters a failure and terminates the node. CloudWatch can be
used to debug such failures.
- Reduce the number of retries for failed REMOVE events in sqswatcher.

**BUG FIXES**
- Fixed a bug in the ordering and retrying of SQS messages that was causing, under certain circumstances of heavy load,
the scheduler configuration to be left in an inconsistent state.
- Delete from queue the REMOVE events that are discarded due to hostname collision with another event fetched as part
of the same `sqswatcher` iteration.

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**CHANGES**
- Remove logic that was adding compute nodes identity to known_hosts file for all OSs except CentOS6

**BUG FIXES**
- Fix Torque issue that was limiting the max number of running jobs to the max size of the cluster.

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**BUG FIXES**
- Fix bug in sqswatcher that was causing the daemon to crash when more than 100 DynamoDB tables are present in the
cluster region.