Upgrade to python track2 sdk for purview

[00Kai0]

First release purview: https://github.com/Azure/sdk-release-request/issues/1151
Update to python track2

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[openapi-pipeline-app]

Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️LintDiff succeeded [Detail] [Expand]

Validation passes for LintDiff.

️️✔️Avocado succeeded [Detail] [Expand]

Validation passes for Avocado.

️️✔️ModelValidation succeeded [Detail] [Expand]

Validation passes for ModelValidation.

️️✔️SemanticValidation succeeded [Detail] [Expand]

Validation passes for SemanticValidation.

️️✔️[Staging] Cross Version BreakingChange (Base on preview version) succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️[Staging] Cross Version BreakingChange (Base on stable version) succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️CredScan succeeded [Detail] [Expand]

There is no credential detected.

_{Posted by Swagger Pipeline | How to fix these errors?}

[openapi-pipeline-app]

Swagger Generation Artifacts

️⚠️ azure-sdk-for-python-track2 warning [Detail]

• ⚠️Warning [Logs]Release - Generate from 08688f3. SDK Automation 14.0.0

  command	sh scripts/automation_init.sh ../azure-sdk-for-python_tmp/initInput.json ../azure-sdk-for-python_tmp/initOutput.json
  cmderr	[automation_init.sh] Ignoring mock: markers 'python_version <= "2.7"' don't match your environment
  cmderr	[automation_init.sh]   Failed building wheel for ConfigArgParse
  cmderr	[automation_init.sh]   Failed building wheel for yarl
  cmderr	[automation_init.sh]   Failed building wheel for wrapt
  cmderr	[automation_init.sh]   Failed building wheel for multidict
  cmderr	[automation_init.sh] Cannot uninstall requirement azure-nspkg, not installed
  cmderr	[automation_init.sh] Command '['/home/vsts/work/1/s/azure-sdk-for-python_tmp/venv-sdk/bin/python', '-m', 'pip', 'uninstall', '-y', 'azure-nspkg']' returned non-zero exit status 1.
  command	sh scripts/automation_generate.sh ../azure-sdk-for-python_tmp/generateInput.json ../azure-sdk-for-python_tmp/generateOutput.json

• ️✔️azure-mgmt-purview [View full logs]  [Release SDK Changes] Breaking Change Detected
  • azure-mgmt-purview-1.0.0b1.zip
  • azure_mgmt_purview-1.0.0b1-py2.py3-none-any.whl

  info	[Changelog]   - Initial Release

️️✔️ azure-sdk-for-go succeeded [Detail] [Expand]

• ️✔️Succeeded [Logs]Release - Generate from 08688f3. SDK Automation 14.0.0

  command	sh ./initScript.sh ../../../../../azure-sdk-for-go_tmp/initInput.json ../../../../../azure-sdk-for-go_tmp/initOutput.json
  command	go run ./tools/generator/main.go ../../../../../azure-sdk-for-go_tmp/generateInput.json ../../../../../azure-sdk-for-go_tmp/generateOutput.json

• ️✔️preview/purview/mgmt/2020-12-01-preview/purview [View full logs]  [Release SDK Changes]

  info	[Changelog] This is a new package

️️✔️[Staging] ApiDocPreview succeeded [Detail] [Expand]

_{Posted by Swagger Pipeline | How to fix these errors?}

[msyyc]

configure python in 'readme.python.md'