[Service Bus] Enable pylint and mypy#11316

Merged

YijunXieMS merged 15 commits intoAzure:masterfrom

YijunXieMS:sb_lint

May 16, 2020

Commits on May 6, 2020

Fix pylint errors other than async-sync overrides
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Commits on May 7, 2020

Restructure message/async message
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Restructure base handler sync/async
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Restructure sb session sync/async
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Enable sb pylint
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Fix mypy errors
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Enable mypy check for ServiceBus
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Commits on May 11, 2020

Add type hints for internal methods
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Fix a pylint disable comment
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Commits on May 12, 2020

Fix a pylint error
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Commits on May 14, 2020

async ReceivedMessage extends sync ReceivedMessage directly
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Change _from_connection_string to
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Remove BaseHandler
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Adjust for pylint 2.3.1
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Fix pylint errors
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