Merge remote-tracking branch 'origin/release/2.1' into release/3.1

# Conflicts:
#	build/sources.props
#	eng/Baseline.Designer.props
#	eng/Baseline.xml
#	eng/PatchConfig.props
#	modules/EntityFrameworkCore
#	src/AzureIntegration/build/repo.targets
#	src/AzureIntegration/build/sources.props
#	src/AzureIntegration/test/Microsoft.AspNetCore.AzureAppServices.FunctionalTests/Assets/NuGet.latest.config
#	src/Http/Http.Extensions/src/SendFileResponseExtensions.cs
#	src/Http/Http.Extensions/test/testfile1kb.txt
#	src/Http/HttpAbstractions.sln
#	src/Installers/Windows/AspNetCoreModule-Setup/ANCMPackageResolver/ANCMPackageResolver.csproj
#	src/Middleware/Middleware.sln
#	src/Middleware/ResponseCompression/src/BodyWrapperStream.cs
#	src/Middleware/ResponseCompression/test/BodyWrapperStreamTests.cs
#	src/Templating/build/sources.props
#	test/Cli.FunctionalTests/NuGetPackageSource.cs
#	version.props

Author: Tratcher