Review Request 74750: ATLAS-4184: updated build/python scripts to replace references to python with python3

[Madhan Neethiraj <ma...@apache.org>]

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Review request for atlas.


Bugs: ATLAS-4184
    https://issues.apache.org/jira/browse/ATLAS-4184


Repository: atlas


Description
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- updated distro/pom.xml to replace reference to python with python3
- updated Docker setup to not install python2


Diffs
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  dev-support/atlas-docker/Dockerfile.atlas-base 4aa225c16 
  distro/pom.xml 9df238eb3 
  distro/src/bin/atlas_admin.py 795a5716f 
  distro/src/bin/atlas_client_cmdline.py f05a3c8f9 
  distro/src/bin/atlas_config.py 31e6fd043 
  distro/src/bin/atlas_kafka_setup.py c13030e88 
  distro/src/bin/atlas_kafka_setup_hook.py cd8c0c3ca 
  distro/src/bin/atlas_start.py ffbe16271 
  distro/src/bin/atlas_stop.py b9cd63689 
  distro/src/bin/atlas_update_simple_auth_json.py 11c249d9b 
  distro/src/bin/cputil.py 8e99f95bc 
  distro/src/bin/quick_start.py 78517f865 
  distro/src/bin/quick_start_v1.py 1c5775a68 
  distro/src/test/mock/setup.py 3639df4a1 
  distro/src/test/python/scripts/TestMetadata.py b813f927f 
  distro/src/test/python/unitTests.py ec1a78cb9 
  tools/atlas-index-repair/src/main/resources/repair_index.py 0333dadca 
  tools/atlas-migration-exporter/atlas_migration_export.py e1b12f609 


Diff: https://reviews.apache.org/r/74750/diff/1/


Testing
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- pre-commit tests run: https://ci-builds.apache.org/job/Atlas/job/PreCommit-ATLAS-Build-Test/1516/
- successfully built and installed Atlas in docker containers having no Python2, using scripts under dev-support/atlas-docker
- verified quick_start.py
- verified Hive and HBase hooks reported entities from respective components
- verified Kafka bridge imported Kafka topics successfully


Thanks,

Madhan Neethiraj