Remove node-debug and node-debug2 obsolete marker files

extensions/ms-vscode.node-debug/package.json

-{
-	"name": "node-debug",
-	"version": "1.6.0",
-	"publisher": "ms-vscode",
-	"engines": {
-		"vscode": "1.6.x"
-	}
-}
\ No newline at end of file

extensions/ms-vscode.node-debug2/package.json

-{
-	"name": "node-debug2",
-	"version": "0.0.3",
-	"publisher": "ms-vscode",
-	"engines": {
-		"vscode": "1.6.x"
-	}
-}
\ No newline at end of file