Enhancements to EMR clusters plugin#1

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dmichalopoulos wants to merge 11 commits intodataiku:masterfrom

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Commits on Aug 26, 2019

May not be needed, but adding __int__.py files anyway.
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boto_params.py contains class-level variables for many commonly used boto3 params.
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Updated version from 0.0.2 to 0.0.3
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Refactoring to use centralized cluster management operations in cluster_ops.py.
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Code to support new macro for copying existing clusters (only allowed for clusters created by DSS, i.e., not attached external clusters).
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Refactoring to use centralized cluster management operations in cluster_ops.py.
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Updated README to include info on (proposed) version 0.0.3 enhancements in this branch.
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Updated requirements.txt, and added support for Python 3.7 in desc.json.
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Commits on Aug 29, 2019

Added more to description of "terminationProtection" param in emr-create-cluster/cluster.json.
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Started working on functions for running user-specified shell commands on cluster nodes.
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Started working on functions for running user-specified shell commands on cluster nodes.
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