Extension consolidation fixes

AspNetCore.sln

eng/Build.props

eng/Dependencies.props

eng/ProjectReferences.props

eng/Versions.props

src/Caching/AspNet.Extensions.ruleset

src/Caching/Caching.slnf

src/Caching/Directory.Build.targets

src/Caching/README.md

src/Caching/SqlServer/Directory.Build.props

...lServer/src/Microsoft.Extensions.Caching.SqlServer.csproj

src/Caching/SqlServer/src/PublicAPI.Shipped.txt

src/Caching/SqlServer/src/PublicAPI.Unshipped.txt

src/Caching/SqlServer/src/SqlQueries.cs

...ching/SqlServer/src/SqlServerCachingServicesExtensions.cs

src/Caching/SqlServer/test/SqlServerCacheWithDatabaseTest.cs

src/Caching/StackExchangeRedis/Directory.Build.props

...rc/Microsoft.Extensions.Caching.StackExchangeRedis.csproj

src/Caching/StackExchangeRedis/src/PublicAPI.Shipped.txt

src/Caching/StackExchangeRedis/src/PublicAPI.Unshipped.txt