Updating KRuntime to not use K.Roslyn
Merge branch 'release' into dev
Adding Roslyn reference to Microsoft.Framework.Runtime.Roslyn

This allows projects that reference Microsoft.Framework.Runtime.Roslyn to
get Roslyn references transitively instead of having to specify it
explicitly.
Run DependencyAnalyzer at the second round build
Update the priority of finding matchs among walk providers

Break the walk providers into to group. The groups use a local file system
based source take the priority.
Review feedback #1
Review feedback #2: Rename property IsLocal to IsHttp