[Network] Bump firewall sdk's api version to 2020-05-01#1861

Merged

yonzhan merged 6 commits intoAzure:masterfrom mmyyrroonn:bump-firewall-sdk

Jun 9, 2020

+23,804-8,862

Commits on Jun 9, 2020

replace sdk
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bump version
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in progress
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revert
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fix tests
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fix style
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