[WIP] Removes *3 verbs, making msbuild the driver (#4456)

Removes *3 verbs, making msbuild the driver

build_projects/dotnet-cli-build/DotNetRestoreProjectJson.cs

@@ -0,0 +1,54 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+namespace Microsoft.DotNet.Cli.Build
+{
+    public class DotNetRestoreProjectJson : DotNetTool
+    {
+        protected override string Command
+        {
+            get { return "restore-projectjson"; }
+        }
+
+        protected override string Args
+        {
+            get { return $"{GetVerbosity()} {GetFallbackSource()} {GetPackages()}"; }
+        }
+
+        public string FallbackSource { get; set; }
+
+        public string Packages { get; set; }
+
+        public string Verbosity { get; set; }
+
+        private string GetFallbackSource()
+        {
+            if (!string.IsNullOrEmpty(FallbackSource))
+            {
+                return $"--fallbacksource {FallbackSource}";
+            }
+
+            return null;
+        }
+
+        private string GetPackages()
+        {
+            if (!string.IsNullOrEmpty(Packages))
+            {
+                return $"--packages {Packages}";
+            }
+
+            return null;
+        }
+
+        private string GetVerbosity()
+        {
+            if (!string.IsNullOrEmpty(Verbosity))
+            {
+                return $"--verbosity {Verbosity}";
+            }
+
+            return null;
+        }
+    }
+}