Don't identity-alias stdlib imports

Fixes stuff like `context "context"` and `http "net/http"`.

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

Author: brandond

v2/generator/import_tracker.go

@@ -47,7 +47,15 @@ func NewImportTrackerForPackage(local string, typesToAdd ...*types.Type) *namer.
 	tracker := namer.NewDefaultImportTracker(types.Name{Package: local})
 	tracker.IsInvalidType = func(*types.Type) bool { return false }
 	tracker.LocalName = func(name types.Name) string { return goTrackerLocalName(&tracker, local, name) }
-	tracker.PrintImport = func(path, name string) string { return name + " \"" + path + "\"" }
+	tracker.PrintImport = func(path, name string) string {
+		// Don't alias stdlib imports. Anything with less than 3 path components
+		// or no dot in the first path component is assumed to be stdlib.
+		dirs := strings.Split(path, namer.GoSeperator)
+		if len(dirs) < 3 || !strings.ContainsRune(dirs[0], '.') {
+			return "\"" + path + "\""
+		}
+		return name + " \"" + path + "\""
+	}
 
 	tracker.AddTypes(typesToAdd...)
 	return &tracker