Make repository management section handle lfs locks (#8726)

* Make repository maangement section handle lfs locks

* Add check attribute handling and handle locking paths better

* More cleanly check-attributes

* handle error

* Check if file exists in default branch before linking to it.

* fixup

* Properly cleanPath

* Use cleanPath

* Sigh

routers/routes/routes.go

@@ -685,6 +685,11 @@ func RegisterRoutes(m *macaron.Macaron) {
 				m.Get("/pointers", repo.LFSPointerFiles)
 				m.Post("/pointers/associate", repo.LFSAutoAssociate)
 				m.Get("/find", repo.LFSFileFind)
+				m.Group("/locks", func() {
+					m.Get("/", repo.LFSLocks)
+					m.Post("/", repo.LFSLockFile)
+					m.Post("/:lid/unlock", repo.LFSUnlock)
+				})
 			})
 
 		}, func(ctx *context.Context) {