Avoid path too long errors when performing BuildV2 builds in MVC repo

- do not glob to the ends of the earth when looking for `project.json` files

nits:
- remove unused variable in `_kpm-build.shade`
- remove incorrect comment in `_kpm-pack.shade`
- clean up some trailing whitespace

build/_k-standard-goals.shade

@@ -117,7 +117,8 @@ default NUGET_FEED = 'https://api.nuget.org/v3/index.json'
       // If the src folder, build and create the packages
       if (Directory.Exists("src"))
       {
-          DnuPack("src/**", BUILD_DIR, Configuration);
+          // Handle projects 1 to 3 levels down from src/, avoiding path too long errors.
+          DnuPack("src/*;src/*/*;src/*/*/*", BUILD_DIR, Configuration);
 
           foreach (var nupkg in Files.Include(Path.Combine(BUILD_DIR, "*/*.nupkg")))
           {
@@ -129,11 +130,17 @@ default NUGET_FEED = 'https://api.nuget.org/v3/index.json'
       var projectsToBuild = new List<string>();
       if (Directory.Exists("test"))
       {
-          projectsToBuild.Add("test/**");
+          // Handle projects 1 to 3 levels down from test/, avoiding path too long errors.
+          projectsToBuild.Add("test/*");
+          projectsToBuild.Add("test/*/*");
+          projectsToBuild.Add("test/*/*/*");
       }
       if (Directory.Exists("samples"))
       {
-          projectsToBuild.Add("samples/**");  
+          // Handle projects 1 to 3 levels down from samples/, avoiding path too long errors.
+          projectsToBuild.Add("samples/*");
+          projectsToBuild.Add("samples/*/*");
+          projectsToBuild.Add("samples/*/*/*");
       }
 
       if (projectsToBuild.Any())

build/_kpm-build.shade

@@ -17,7 +17,6 @@ default build_options='${E("NUGET3_build_options")}'
     if (IsBuildV2)
     {
         var projectsToPack = new List<string>();
-    
         foreach(var arg in projectFile.Split((char)';'))
         {
             if (!arg.Contains("*"))
@@ -50,7 +49,6 @@ default build_options='${E("NUGET3_build_options")}'
     else
     {
         var projectFolder=Path.GetDirectoryName(projectFile);
-        var projectName=Path.GetFileName(projectFolder);
         var projectBin=Path.Combine(projectFolder, "bin", configuration);
 
         DeleteFolder(projectBin);

build/_kpm-pack.shade

@@ -1,7 +1,7 @@
 @{/*
 
 kpm-pack
-    Builds package from project. Downloads and executes k sdk tools.
+    Builds package from project.
 
 projectFile=''
     Required. Path to the project.json to build.
@@ -20,7 +20,6 @@ default pack_options='${E("NUGET3_pack_options")}'
     if (IsBuildV2)
     {
         var projectsToPack = new List<string>();
-    
         foreach(var arg in projectFile.Split((char)';'))
         {
             if (!arg.Contains("*"))