Trigger rebuild when the CLI changed

- Stamp each project with the CLI version it was last compiled with
- Rebuild those projects with a local version file that does not match the one of the current CLI that is building it

test/dotnet-build.Tests/IncrementalTestBase.cs

@@ -124,5 +124,12 @@ namespace Microsoft.DotNet.Tools.Builder.Tests
 
             return executablePath;
         }
+
+        protected string GetIntermediaryOutputPath()
+        {
+            var executablePath = Path.Combine(TestProjectRoot, "obj", "Debug", "netstandardapp1.5");
+
+            return executablePath;
+        }
     }
 }