Load and calculate Destination of files for kustomize localize (#4652)

* Implement file localization for localize

Implement file localization for new command kustomize localize

* Patch file localization

Fix lint errors, address feedback, begin transition to file loader from
localizer

* Add Repo() to Loader

* Implement locLoader factory + cleanup

* Add domain to RepoSpec

Fix ssh relative url host parsing for non-github domain on the side

* Implement Load(), New(), Root(), Dst() for LocLoader

* Address repospec code review comments

* Address 1st round of code review feedback

* Address feedback #2

Removed localized path calculations to cover edge case and improve readability.

* Remove ldr Cleanup logging

* Address code review round #3

* Address code review feedback #4

kyaml/filesys/filesystem.go

@@ -23,10 +23,10 @@ type FileSystem interface {
 	// Create a file.
 	Create(path string) (File, error)
 
-	// MkDir makes a directory.
+	// Mkdir makes a directory.
 	Mkdir(path string) error
 
-	// MkDirAll makes a directory path, creating intervening directories.
+	// MkdirAll makes a directory path, creating intervening directories.
 	MkdirAll(path string) error
 
 	// RemoveAll removes path and any children it contains.
@@ -45,7 +45,7 @@ type FileSystem interface {
 	// directory and a file name, where the directory
 	// is represented as a ConfirmedDir and all that implies.
 	// If the entire path is a directory, the file component
-	// is an empty string.
+	// is an empty string. Path can be relative.
 	CleanedAbs(path string) (ConfirmedDir, string, error)
 
 	// Exists is true if the path exists in the file system.